Cabbage
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 966
Cabbage Maggot
- Group
- True flies
- Peak month
- May
- Records since 2000
- 821
Cabbage Moth
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 1,384
Cabbage Seedpod Weevil
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 997
Cabbage Stem Flea Beetle
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 1,230
Cabbage Stem Weevil
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 1,381
Cabbage tree
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 362
Caberea ellisii
- Group
- Bryozoans
- Peak month
- August
- Records since 2000
- 73
Cackling Goose
- Group
- Birds
- Peak month
- January
- Records since 2000
- 515
Cacoecimorpha pronubana
- Group
- Butterflies and moths
- Peak month
- May
- Records since 2000
- 216
Cacopsylla brunneipennis
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 63
Cacopsylla fulguralis
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 195
Cacopsylla hippophaes
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 68
Cacopsylla melanoneura
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 335
Cacopsylla peregrina
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 283
Cacopsylla visci
- Group
- True bugs
- Peak month
- September
- Records since 2000
- 79
Cacoxenus indagator
- Group
- True flies
- Peak month
- May
- Records since 2000
- 177
Caecilius fuscopterus
- Group
- Other insects
- Peak month
- September
- Records since 2000
- 67
Caecosagitta macrocephala
- Group
- Other invertebrates
- Peak month
- August
- Records since 2000
- 540
Caecum trachea
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 69
Caenis horaria
- Group
- Mayflies
- Peak month
- March
- Records since 2000
- 113
Caenis luctuosa
- Group
- Mayflies
- Peak month
- April
- Records since 2000
- 409
Caenis pusilla
- Group
- Mayflies
- Peak month
- April
- Records since 2000
- 68
Caenis rivulorum
- Group
- Mayflies
- Peak month
- April
- Records since 2000
- 2,004
Caenis robusta
- Group
- Mayflies
- Peak month
- May
- Records since 2000
- 97
Caenopsis waltoni
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 140
Cafius xantholoma
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 85
Calameuta filiformis
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 222
Calameuta pallipes
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 174
Calamoncosis aprica
- Group
- True flies
- Peak month
- June
- Records since 2000
- 135
Calamoncosis minima
- Group
- True flies
- Peak month
- June
- Records since 2000
- 226
Calamosternus granarius
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 67
Calanus finmarchicus
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 4,742
Calanus helgolandicus
- Group
- Crustaceans
- Peak month
- September
- Records since 2000
- 11,552
Calaphis flava
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 67
Calathus ambiguus
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 178
Calathus cinctus
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 595
Calathus erratus
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 319
Calathus melanocephalus
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 1,410
Calathus micropterus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 281
Calathus mollis
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 525
Calathus rotundicollis
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 798
Calcareous gymnostomum moss
- Group
- Mosses
- Peak month
- May
- Records since 2000
- 203
Calcareous rimmed lichen
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 2,373
Calcareous scribble lichen
- Group
- Lichens
- Peak month
- August
- Records since 2000
- 1,258
Calcareous tubeworm
- Group
- Worms (annelids)
- Peak month
- September
- Records since 2000
- 1,813
Calcarisporium arbuscula
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 149
Caledonia pannaria
- Group
- Lichens
- Peak month
- July
- Records since 2000
- 51
Caliadurgus fasciatellus
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 124
Calicium notarisii
- Group
- Lichens
- Peak month
- September
- Records since 2000
- 54
Calicophoron daubneyi
- Group
- Flatworms
- Records since 2000
- 108
- Kingdom
- Animalia
California brome
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 95
Californian Poppy
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 493
Caliroa annulipes
- Group
- Bees, wasps and ants
- Peak month
- September
- Records since 2000
- 101
Calliblepharis jubata
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 251
Callicera aurata
- Group
- True flies
- Peak month
- August
- Records since 2000
- 82
Callicera rufa
- Group
- True flies
- Peak month
- May
- Records since 2000
- 106
Callicladium imponens
- Group
- Mosses
- Peak month
- October
- Records since 2000
- 82
Callicorixa praeusta
- Group
- True bugs
- Peak month
- September
- Records since 2000
- 2,085
Callicorixa wollastoni
- Group
- True bugs
- Peak month
- April
- Records since 2000
- 254
Calliopum aeneum
- Group
- True flies
- Peak month
- July
- Records since 2000
- 266
Calliopum elisae
- Group
- True flies
- Peak month
- June
- Records since 2000
- 162
Calliopum simillimum
- Group
- True flies
- Peak month
- June
- Records since 2000
- 221
Calliostoma granulatum
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 106
Callipallene brevirostris
- Group
- Other invertebrates
- Peak month
- August
- Records since 2000
- 801
Calliphora loewi
- Group
- True flies
- Peak month
- August
- Records since 2000
- 78
Calliphora subalpina
- Group
- True flies
- Peak month
- August
- Records since 2000
- 79
Calliphora uralensis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 124
Callistephanus pallida
- Group
- Jellyfish, corals and anemones
- Peak month
- August
- Records since 2000
- 429
Callisto denticulella
- Group
- Butterflies and moths
- Peak month
- October
- Records since 2000
- 220
Callithamnion tetragonum
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 74
Callitula pyrrhogaster
- Group
- Bees, wasps and ants
- Peak month
- September
- Records since 2000
- 94
Callochiton septemvalvis
- Group
- Molluscs
- Peak month
- July
- Records since 2000
- 227
Callopora discreta
- Group
- Bryozoans
- Peak month
- January
- Records since 2000
- 102
Callopora dumerilii
- Group
- Bryozoans
- Peak month
- August
- Records since 2000
- 1,030
Callopora lineata
- Group
- Bryozoans
- Peak month
- June
- Records since 2000
- 262
Calloria tremelloides
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 516
Calobata petronella
- Group
- True flies
- Peak month
- June
- Records since 2000
- 79
Calocaris macandreae
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 1,010
Calocoris alpestris
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 481
Calocoris roseomaculatus
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 453
Calodromius spilotus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 940
Calogaya arnoldii
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 167
Calomicrus circumfusus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 52
Calomosternus granarius
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 225
Caloneis bacillum
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 232
Caloplaca chlorina
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 568
Caloplaca littorea
- Group
- Lichens
- Peak month
- August
- Records since 2000
- 63
Caloplaca marina
- Group
- Lichens
- Peak month
- September
- Records since 2000
- 238
Caloplaca obscurella
- Group
- Lichens
- Peak month
- February
- Records since 2000
- 458
Caloplaca ochracea
- Group
- Lichens
- Peak month
- November
- Records since 2000
- 269
Caloplaca ruderum
- Group
- Lichens
- Peak month
- August
- Records since 2000
- 304
Caloptilia alchimiella
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 144
Caloptilia azaleella
- Group
- Butterflies and moths
- Peak month
- May
- Records since 2000
- 112
Caloptilia betulicola
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 92
Caloptilia cuculipennella
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 67
Caloptilia elongella
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 169
Caloptilia falconipennella
- Group
- Butterflies and moths
- Peak month
- September
- Records since 2000
- 68
Caloptilia populetorum
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 66
Caloptilia robustella
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 174
Caloptilia rufipennella
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 254
Caloptilia semifascia
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 278
Calvia 14-guttata
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 10,137
Calvitimela aglaea
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 76
Calybites phasianipennella
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 70
Calycina claroflava
- Group
- Fungi
- Peak month
- November
- Records since 2000
- 343
Calycina herbarum
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 98
Calypogeia azurea
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 75
Calypogeia neesiana
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 57
Calypogeia suecica
- Group
- Liverworts
- Peak month
- February
- Records since 2000
- 52
Calyptella capula
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 231
Calystegia lucana
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 156
Calythea nigricans
- Group
- True flies
- Peak month
- August
- Records since 2000
- 72
Camarops polysperma
- Group
- Fungi
- Peak month
- February
- Records since 2000
- 60
Camarosporium oreades
- Group
- Fungi
- Peak month
- March
- Records since 2000
- 64
Camarota curvipennis
- Group
- True flies
- Peak month
- July
- Records since 2000
- 61
Campanularia hincksii
- Group
- Jellyfish, corals and anemones
- Peak month
- January
- Records since 2000
- 178
Campanulina pumila
- Group
- Jellyfish, corals and anemones
- Peak month
- September
- Records since 2000
- 117
Campichoeta obscuripennis
- Group
- True flies
- Peak month
- July
- Records since 2000
- 189
Campichoeta punctum
- Group
- True flies
- Peak month
- July
- Records since 2000
- 95
Campiglossa plantaginis
- Group
- True flies
- Peak month
- July
- Records since 2000
- 174
Campiglossa producta
- Group
- True flies
- Peak month
- July
- Records since 2000
- 65
Campion
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 904
Campsicnemus alpinus
- Group
- True flies
- Peak month
- June
- Records since 2000
- 72
Campsicnemus armatus
- Group
- True flies
- Peak month
- June
- Records since 2000
- 81
Campsicnemus curvipes
- Group
- True flies
- Peak month
- June
- Records since 2000
- 586
Campsicnemus loripes
- Group
- True flies
- Peak month
- June
- Records since 2000
- 254
Campsicnemus scambus
- Group
- True flies
- Peak month
- June
- Records since 2000
- 633
Camptochaeta furcata
- Group
- True flies
- Peak month
- August
- Records since 2000
- 112
Camptocladius stercorarius
- Group
- True flies
- Peak month
- July
- Records since 2000
- 108
Camptoptera papaveris
- Group
- Bees, wasps and ants
- Peak month
- October
- Records since 2000
- 57
Campylaspis costata
- Group
- Crustaceans
- Peak month
- January
- Records since 2000
- 71
Campylaspis legendrei
- Group
- Crustaceans
- Peak month
- April
- Records since 2000
- 107
Campylaspis rubicunda
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 77
Campylobacter coli
- Group
- Microorganisms and protists
- Peak month
- October
- Records since 2000
- 725
Campylobacter jejuni
- Group
- Microorganisms and protists
- Peak month
- December
- Records since 2000
- 2,359
Campylomyza flavipes
- Group
- True flies
- Peak month
- December
- Records since 2000
- 2,470
Campylophyllopsis calcarea
- Group
- Mosses
- Peak month
- April
- Records since 2000
- 152
Campylopus shawii
- Group
- Mosses
- Peak month
- June
- Records since 2000
- 197
Canada Goose (canadensis Group)
- Group
- Birds
- Peak month
- April
- Records since 2000
- 646,411
Canada Warbler
- Group
- Birds
- Peak month
- September
- Records since 2000
- 60
Canada yew
- Group
- Conifers
- Peak month
- April
- Records since 2000
- 11,357
Canadian Bunchberry
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 63
Canadian Fleabane
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 1,998
Canadian Goldenrod
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 835
Canadian Waterweed
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 6,360
Canary whiskers
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 240
Canary-shouldered Thorn
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 2,373
Cancerilla tubulata
- Group
- Crustaceans
- Peak month
- June
- Records since 2000
- 70
Candacia armata
- Group
- Crustaceans
- Peak month
- October
- Records since 2000
- 1,985
Candelabrum cocksii
- Group
- Jellyfish, corals and anemones
- Peak month
- April
- Records since 2000
- 58
Candelariella coralliza
- Group
- Lichens
- Peak month
- October
- Records since 2000
- 247
Candelariella flavovirella
- Group
- Lichens
- Peak month
- September
- Records since 2000
- 51
Candelariella reflexa
- Group
- Lichens
- Peak month
- April
- Records since 2000
- 1,902
Candida tropicalis
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 126
Candidula unifasciata
- Group
- Molluscs
- Peak month
- July
- Records since 2000
- 60
Candleflame Lichen
- Group
- Lichens
- Peak month
- March
- Records since 2000
- 662
Candlesnuff Fungus
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 7,940
Candolleomyces leucotephrus
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 55
Candy lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 420
Candy Stripe Flatworm
- Group
- Flatworms
- Peak month
- July
- Records since 2000
- 1,494
Canoe-shell
- Group
- Molluscs
- Peak month
- March
- Records since 2000
- 543
Canterbury-bells
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 89
Cantharellus amethysteus
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 85
Cantharid beetle
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 1,011
Cantharis cryptica
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 1,714
Cantharis decipiens
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 1,947
Cantharis figurata
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 349
Cantharis flavilabris
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 1,930
Cantharis fusca
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 395
Cantharis lateralis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 1,268
Cantharis obscura
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 105
Cantharis pallida
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 860
Cantharis paludosa
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 89
Cantharis pellucida
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 2,305
Canvasback
- Group
- Birds
- Peak month
- November
- Records since 2000
- 395
Cape Cormorant
- Group
- Birds
- Peak month
- October
- Records since 2000
- 74
Cape Gannet
- Group
- Birds
- Peak month
- October
- Records since 2000
- 74
Cape gooseberry
- Group
- Flowering plants
- Peak month
- September
- Records since 2000
- 87
Cape pondweed
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 136
Cape Shelduck
- Group
- Birds
- Peak month
- August
- Records since 2000
- 271
Cape Thread-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 6,160
Cape Verde Petrel
- Group
- Birds
- Peak month
- October
- Records since 2000
- 74
Cape Verde Shearwater
- Group
- Birds
- Peak month
- October
- Records since 2000
- 74
Caper Spurge
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 4,369
Capillary Thread-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 31,536
Capitate Notchwort
- Group
- Liverworts
- Peak month
- March
- Records since 2000
- 497
Capitella minima
- Group
- Worms (annelids)
- Peak month
- September
- Records since 2000
- 229
Capitellid Thread Worm
- Group
- Worms (annelids)
- Peak month
- May
- Records since 2000
- 1,059
Capnea sanguinea
- Group
- Jellyfish, corals and anemones
- Peak month
- July
- Records since 2000
- 307
Cappadocian maple
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 123
Capped Orb Mussel
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 671
Capra's Water Cricket
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 2,402
Caprella acanthifera
- Group
- Crustaceans
- Peak month
- September
- Records since 2000
- 562
Caprella mutica
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 448
Caprella septentrionalis
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 51
Capronia nigerrima
- Group
- Fungi
- Peak month
- March
- Records since 2000
- 57
Capua vulgana
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 244
Capulus ungaricus
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 139
Carabus arvensis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 244
Carabus cancellatus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 88
Carabus nitens
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 181
Caradrina kadenii
- Group
- Butterflies and moths
- Peak month
- October
- Records since 2000
- 124
Carassin
- Group
- Fish
- Peak month
- November
- Records since 2000
- 389
Carbuncular Rock-shield Lichen
- Group
- Lichens
- Peak month
- April
- Records since 2000
- 621
Carcelia lucorum
- Group
- True flies
- Peak month
- August
- Records since 2000
- 172
Carcelia tibialis
- Group
- True flies
- Peak month
- May
- Records since 2000
- 60
Cardamine raphanifolia
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 87
Carder Bumble Bee
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 4,638
Cardiastethus fasciiventris
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 557
Cardinal Click Beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 57
Cardiomya costellata
- Group
- Molluscs
- Peak month
- March
- Records since 2000
- 82
Cardoon
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 257
Carex fulva
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 57
Carex leersii
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 53
Carex oederi
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 247
Carex pairae
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 264
Caricea alma
- Group
- True flies
- Peak month
- April
- Records since 2000
- 103
Caricea erythrocera
- Group
- True flies
- Peak month
- June
- Records since 2000
- 701
Caricea pallipalpis
- Group
- True flies
- Peak month
- April
- Records since 2000
- 94
Caricea verna
- Group
- True flies
- Peak month
- July
- Records since 2000
- 50
Carline Thistle
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 1,937
Carnation Sedge
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 6,500
Carnobacterium maltaromaticum
- Group
- Microorganisms and protists
- Peak month
- February
- Records since 2000
- 57
Carolina phaeoceros
- Group
- Hornworts
- Peak month
- November
- Records since 2000
- 79
Carpatolechia fugitivella
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 54
Carpatolechia proximella
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 182
Carpelimus bilineatus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 71
Carpelimus corticinus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 225
Carpelimus elongatulus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 133
Carpelimus rivularis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 144
Carpenter bee
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 109
Carpet beetle
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 287
Carpin's Snout Beetle
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 84
Carrageen
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 5,647
Carrion Crow
- Group
- Birds
- Peak month
- April
- Records since 2000
- 1,495,275
Carrot-sponge
- Group
- Sponges
- Peak month
- July
- Records since 2000
- 6,282
Carsia sororiata
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 75
Cartilage lichen
- Group
- Lichens
- Peak month
- March
- Records since 2000
- 2,916
Cartilage Lichen
- Group
- Lichens
- Peak month
- February
- Records since 2000
- 951
Cartilage lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 314
Cartilage lichen
- Group
- Lichens
- Peak month
- September
- Records since 2000
- 162
Caryophyllia inornata
- Group
- Jellyfish, corals and anemones
- Peak month
- August
- Records since 2000
- 312
Caryophylloseptoria lychnidis
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 55
Caspian Gull
- Group
- Birds
- Peak month
- January
- Records since 2000
- 12,452
Caspian mud shrimp
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 3,122
Caspian Tern
- Group
- Birds
- Peak month
- July
- Records since 2000
- 826
Cassida murraea
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 199
Cassida nebulosa
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 69
Cassida nobilis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 99
Cassida prasina
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 60
Cassida vibex
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 1,307
Cassida vittata
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 145
Cat
- Group
- Mammals
- Peak month
- January
- Records since 2000
- 2,121
Cat's-ear
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 14,718
Cat-mint
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 114
Cat-tongue Liverwort
- Group
- Liverworts
- Peak month
- April
- Records since 2000
- 1,645
Cataetyx laticeps
- Group
- Fish
- Peak month
- September
- Records since 2000
- 63
Catapion pubescens
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 129
Catapion seniculus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 357
Catapyrenium cinereum
- Group
- Fungi
- Peak month
- July
- Records since 2000
- 62
Catapyrenium pilosellum
- Group
- Fungi
- Peak month
- November
- Records since 2000
- 63
Catapyrenium squamulosum
- Group
- Fungi
- Peak month
- November
- Records since 2000
- 251
Catenella caespitosa
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 696
Caterpillar-hunter
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 73
Cathormiocerus spinosus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 128
Catillaria atomarioides
- Group
- Lichens
- Peak month
- September
- Records since 2000
- 273
Catillaria lichen
- Group
- Lichens
- Peak month
- July
- Records since 2000
- 1,811
Catillaria lichen
- Group
- Lichens
- Peak month
- September
- Records since 2000
- 999
Catillaria nigroclavata
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 230
Catinaria lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 681
Catinella olivacea
- Group
- Fungi
- Peak month
- August
- Records since 2000
- 63
Catops coracinus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 63
Catops fuliginosus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 116
Catops grandicollis
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 67
Catops morio
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 105
Catops nigricans
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 149
Catops tristis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 116
Catriona gymnota
- Group
- Molluscs
- Peak month
- July
- Records since 2000
- 52
Cattail bug
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 565
Cattle Egret
- Group
- Birds
- Peak month
- October
- Records since 2000
- 27,274
Catworm
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 11,643
Caucasian stonecrop
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 336
Cauchas fibulella
- Group
- Butterflies and moths
- Peak month
- May
- Records since 2000
- 128
Cauchas rufimitrella
- Group
- Butterflies and moths
- Peak month
- May
- Records since 2000
- 273
Caulacanthus okamurae
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 147
Caulacanthus ustulatus
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 51
Caulleriella alata
- Group
- Worms (annelids)
- Peak month
- August
- Records since 2000
- 9,633
Caulleriella bioculata
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 888
Cauloramphus spiniferum
- Group
- Bryozoans
- Peak month
- September
- Records since 2000
- 344
Cavariella pastinacae
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 82
Cavariella theobaldi
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 57
Cave Spider
- Group
- Spiders
- Peak month
- August
- Records since 2000
- 596
Cave-burrowing anemone
- Group
- Jellyfish, corals and anemones
- Peak month
- August
- Records since 2000
- 1,281
Cecidophyes nudus
- Group
- Mites, harvestmen and other arachnids
- Peak month
- September
- Records since 2000
- 255
Cecidophyopsis psilaspis
- Group
- Mites, harvestmen and other arachnids
- Peak month
- April
- Records since 2000
- 51
Cecilioides acicula
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 202
Cedar of Lebanon
- Group
- Conifers
- Peak month
- August
- Records since 2000
- 212
Cedarwood Waxcap
- Group
- Fungi
- Peak month
- November
- Records since 2000
- 1,356
Cedestis subfasciella
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 65
Celandine Clustercup Rust
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 474
Celery Leaf Beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 1,265
Celery-leaved Buttercup
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 2,860
Cellar Snail
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 3,561
Cellaria fistulosa
- Group
- Bryozoans
- Peak month
- June
- Records since 2000
- 1,936
Cellaria sinuosa
- Group
- Bryozoans
- Peak month
- July
- Records since 2000
- 240
Cellepora pumicosa
- Group
- Bryozoans
- Peak month
- July
- Records since 2000
- 5,108
Celleporella hyalina
- Group
- Bryozoans
- Peak month
- June
- Records since 2000
- 983
Celleporina caliciformis
- Group
- Bryozoans
- Peak month
- July
- Records since 2000
- 127
Celleporina decipiens
- Group
- Bryozoans
- Peak month
- January
- Records since 2000
- 57
Celothelium ischnobelum
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 72
Celtic sea slug
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 668
Celypha rufana
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 59
Centipede
- Group
- Centipedes
- Peak month
- June
- Records since 2000
- 590
Centraloecetes kroyeranus
- Group
- Crustaceans
- Peak month
- April
- Records since 2000
- 1,278
Centraloecetes striatus
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 161
Centre-barred Sallow
- Group
- Butterflies and moths
- Peak month
- September
- Records since 2000
- 2,363
Centric undif
- Group
- Microorganisms and protists
- Peak month
- October
- Records since 2000
- 171
Centromerita bicolor
- Group
- Spiders
- Peak month
- November
- Records since 2000
- 150
Centromerita concinna
- Group
- Spiders
- Peak month
- October
- Records since 2000
- 167
Centromerus dilutus
- Group
- Spiders
- Peak month
- October
- Records since 2000
- 107
Centropages hamatus
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 1,572
Centropages typicus
- Group
- Crustaceans
- Peak month
- September
- Records since 2000
- 7,143
Centroptilum luteolum
- Group
- Mayflies
- Peak month
- April
- Records since 2000
- 108
Cep, Penny Bun
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,807
Cepero’s Groundhopper
- Group
- Grasshoppers and crickets
- Peak month
- May
- Records since 2000
- 169
Cephalothrix linearis
- Group
- Other invertebrates
- Peak month
- September
- Records since 2000
- 84
Cephalothrix rufifrons
- Group
- Other invertebrates
- Peak month
- May
- Records since 2000
- 82
Cephus spinipes
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 262
Ceraclea albimacula
- Group
- Caddisflies
- Peak month
- June
- Records since 2000
- 383
Ceraclea annulicornis
- Group
- Caddisflies
- Peak month
- October
- Records since 2000
- 400
Ceraclea dissimilis
- Group
- Caddisflies
- Peak month
- July
- Records since 2000
- 1,106
Ceraclea fulva
- Group
- Caddisflies
- Peak month
- July
- Records since 2000
- 374
Ceraclea nigronervosa
- Group
- Caddisflies
- Peak month
- May
- Records since 2000
- 319
Ceraclea senilis
- Group
- Caddisflies
- Peak month
- June
- Records since 2000
- 461
Ceramium botryocarpum
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 243
Ceramium cimbricum
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 73
Ceramium deslongchampsii
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 355
Ceramium echionotum
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 179
Ceramium gaditanum
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 89
Ceramium pallidum
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 244
Ceramium secundatum
- Group
- Seaweeds and algae
- Peak month
- July
- Records since 2000
- 267
Ceramium shuttleworthianum
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 372
Cerapheles terminatus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 224
Ceratapion carduorum
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 255
Ceratapion gibbirostre
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 465
Ceratapion onopordi
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 758
Cerataulina bergonii
- Group
- Seaweeds and algae
- Peak month
- June
- Records since 2000
- 470
Cerataulus granulata
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 61
Ceratinella brevipes
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 274
Ceratinella brevis
- Group
- Spiders
- Peak month
- August
- Records since 2000
- 54
Ceratinella scabrosa
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 59
Ceratinostoma ostiorum
- Group
- True flies
- Peak month
- June
- Records since 2000
- 81
Ceratium hexacanthum
- Group
- Microorganisms and protists
- Peak month
- October
- Records since 2000
- 265
Ceratobarys decipiens
- Group
- True flies
- Peak month
- December
- Records since 2000
- 106
Ceratocephale loveni
- Group
- Worms (annelids)
- Peak month
- October
- Records since 2000
- 163
Ceratopogon grandiforceps
- Group
- True flies
- Peak month
- May
- Records since 2000
- 168
Ceratopogon lacteipennis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 641
Ceratopogon nitidulus
- Group
- True flies
- Peak month
- May
- Records since 2000
- 141
Ceratopogon punctatus
- Group
- True flies
- Peak month
- June
- Records since 2000
- 101
Ceratopogon sociabilis
- Group
- True flies
- Peak month
- May
- Records since 2000
- 142
Cerceris ruficornis
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 77
Cercidia prominens
- Group
- Spiders
- Peak month
- August
- Records since 2000
- 109
Cercidospora lichen
- Group
- Fungi
- Peak month
- July
- Records since 2000
- 89
Cercospora mercurialis
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 150
Cercyon analis
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 141
Cercyon convexiusculus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 895
Cercyon haemorrhoidalis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 173
Cercyon impressus
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 193
Cercyon lateralis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 140
Cercyon littoralis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 139
Cercyon marinus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 205
Cercyon pygmaeus
- Group
- Beetles
- Peak month
- September
- Records since 2000
- 98
Cercyon sternalis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 244
Cercyon tristis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 336
Cercyon ustulatus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 300
Cereal Fly
- Group
- True flies
- Peak month
- June
- Records since 2000
- 1,734
Cereal leaf beetle
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 250
Ceriporia purpurea
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 64
Ceriporia reticulata
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 151
Ceriporia viridans
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 124
Cerobasis guestfalica
- Group
- Other insects
- Peak month
- September
- Records since 2000
- 447
Cerodontha atra
- Group
- True flies
- Peak month
- July
- Records since 2000
- 398
Cerodontha bimaculata
- Group
- True flies
- Peak month
- May
- Records since 2000
- 87
Cerodontha biseta
- Group
- True flies
- Peak month
- June
- Records since 2000
- 67
Cerodontha denticornis
- Group
- True flies
- Peak month
- July
- Records since 2000
- 256
Cerodontha fulvipes
- Group
- True flies
- Peak month
- August
- Records since 2000
- 79
Cerodontha ircos
- Group
- True flies
- Peak month
- August
- Records since 2000
- 118
Cerodontha lateralis
- Group
- True flies
- Peak month
- August
- Records since 2000
- 86
Cerodontha luctuosa
- Group
- True flies
- Peak month
- July
- Records since 2000
- 99
Cerodontha muscina
- Group
- True flies
- Peak month
- July
- Records since 2000
- 403
Ceromya bicolor
- Group
- True flies
- Peak month
- May
- Records since 2000
- 78
Ceroxys urticae
- Group
- True flies
- Peak month
- June
- Records since 2000
- 157
Cerrena unicolor
- Group
- Fungi
- Peak month
- December
- Records since 2000
- 64
Cerylon ferrugineum
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 520
Cerylon histeroides
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 365
Cetema elongatum
- Group
- True flies
- Peak month
- June
- Records since 2000
- 134
Cetema neglectum
- Group
- True flies
- Peak month
- June
- Records since 2000
- 93
Cetema simile
- Group
- True flies
- Peak month
- June
- Records since 2000
- 66
Cetraria muricata
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 377
Cetti's Warbler
- Group
- Birds
- Peak month
- April
- Records since 2000
- 223,821
Ceutorhynchus alliariae
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 53
Ceutorhynchus assimilis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 177
Ceutorhynchus cochleariae
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 71
Ceutorhynchus contractus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 374
Ceutorhynchus erysimi
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 286
Ceutorhynchus picitarsis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 132
Ceutorhynchus pyrrhorhynchus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 98
Ceutorhynchus typhae
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 395
Chabot Bullhead
- Group
- Fish
- Peak month
- June
- Records since 2000
- 772
Chaenotheca trichialis
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 607
Chaenothecopsis nigra
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 156
Chaenothecopsis pusilla
- Group
- Fungi
- Peak month
- June
- Records since 2000
- 91
Chaerophyllum aureum
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 83
Chaetarthria seminulum
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 72
Chaetarthria simillima
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 97
Chaetoceros affinis
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 70
Chaetoceros danicus
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 91
Chaetoceros decipiens
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 80
Chaetoceros densus
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 78
Chaetoceros sociale
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 142
Chaetoceros teres
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 57
Chaetocladius melaleucus
- Group
- True flies
- Peak month
- November
- Records since 2000
- 120
Chaetocladius perennis
- Group
- True flies
- Peak month
- February
- Records since 2000
- 197
Chaetocladius piger
- Group
- True flies
- Peak month
- February
- Records since 2000
- 2,768
Chaetocnema concinna
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 436
Chaetocnema hortensis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 542
Chaetocnema picipes
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 86
Chaetomium globosum
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 103
Chaetomorpha ligustica
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 589
Chaetomorpha melagonium
- Group
- Seaweeds and algae
- Peak month
- July
- Records since 2000
- 234
Chaetoparia nilssoni
- Group
- Worms (annelids)
- Peak month
- May
- Records since 2000
- 162
Chaetopleurophora erythronota
- Group
- True flies
- Peak month
- August
- Records since 2000
- 67
Chaetopodella scutellaris
- Group
- True flies
- Peak month
- August
- Records since 2000
- 291
Chaetopteryx villosa
- Group
- Caddisflies
- Peak month
- May
- Records since 2000
- 5,313
Chaetorellia jaceae
- Group
- True flies
- Peak month
- July
- Records since 2000
- 56
Chaetosphaerella phaeostroma
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 604
Chaetostigmoptera montivaga
- Group
- True flies
- Peak month
- July
- Records since 2000
- 118
Chaetostomella cylindrica
- Group
- True flies
- Peak month
- July
- Records since 2000
- 216
Chaetozone christiei
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 4,906
Chaetozone gibber
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 3,316
Chaetozone jubata
- Group
- Worms (annelids)
- Peak month
- April
- Records since 2000
- 81
Chaetozone setosa
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 7,513
Chaetozone vivipara
- Group
- Worms (annelids)
- Peak month
- April
- Records since 2000
- 130
Chaetozone zetlandica
- Group
- Worms (annelids)
- Peak month
- August
- Records since 2000
- 7,129
Chaffweed
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 76
Chalarus spurius
- Group
- True flies
- Peak month
- May
- Records since 2000
- 145
Chalciporus rubinus
- Group
- Fungi
- Peak month
- August
- Records since 2000
- 53
Chalcosyrphus eunotus
- Group
- True flies
- Peak month
- May
- Records since 2000
- 86
Chalice lichen
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 52
Chalk Carpet
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 306
Chalk Comb-moss
- Group
- Mosses
- Peak month
- April
- Records since 2000
- 10,936
Chalk Furrow Bee
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 462
Chalk Milkwort
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 178
Chalk rock-bristle
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 195
Chalk-hill Blue
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 60,252
Chamaeleon prawn
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 851
Chamaemyces fracidus
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 62
Chamaemyia aridella
- Group
- True flies
- Peak month
- July
- Records since 2000
- 188
Chamaemyia flavipalpis
- Group
- True flies
- Peak month
- July
- Records since 2000
- 256
Chamaemyia herbarum
- Group
- True flies
- Peak month
- July
- Records since 2000
- 256
Chamaemyia juncorum
- Group
- True flies
- Peak month
- June
- Records since 2000
- 52
Chamaemyia polystigma
- Group
- True flies
- Peak month
- June
- Records since 2000
- 140
Chamaepsylla hartigii
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 129
Chamaesiphon minutus
- Group
- Microorganisms and protists
- Peak month
- January
- Records since 2000
- 146
Chamomile
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 251
Chamomile shark
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 67
Champia parvula
- Group
- Seaweeds and algae
- Peak month
- March
- Records since 2000
- 78
Changing Forget-me-not
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 1,909
Channelled Crystalwort
- Group
- Liverworts
- Peak month
- September
- Records since 2000
- 53
Channelled Wrack
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,729
Chanterelle
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 1,593
Chaoborus crystallinus
- Group
- True flies
- Peak month
- June
- Records since 2000
- 287
Chaoborus flavicans
- Group
- True flies
- Peak month
- June
- Records since 2000
- 1,393
Chaoborus pallidus
- Group
- True flies
- Peak month
- July
- Records since 2000
- 150
Chara aspera
- Group
- Seaweeds and algae
- Peak month
- June
- Records since 2000
- 61
Chara contraria
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 62
Chara globularis
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 231
Chara hispida
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 257
Chara virgata
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 241
Chara vulgaris
- Group
- Seaweeds and algae
- Peak month
- June
- Records since 2000
- 442
Charagmus griseus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 250
Charagochilus gyllenhalii
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 184
Charanyca ferruginea
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 2,314
Charcoal Burner
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 1,585
Charlock
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 1,733
Chartella papyracea
- Group
- Bryozoans
- Peak month
- September
- Records since 2000
- 1,195
Chartoscirta cincta
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 415
Chartoscirta cocksii
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 94
Cheilosia albipila
- Group
- True flies
- Peak month
- April
- Records since 2000
- 141
Cheilosia antiqua
- Group
- True flies
- Peak month
- May
- Records since 2000
- 129
Cheilosia bergenstammi
- Group
- True flies
- Peak month
- August
- Records since 2000
- 892
Cheilosia caerulescens
- Group
- True flies
- Peak month
- July
- Records since 2000
- 325
Cheilosia corydon
- Group
- True flies
- Peak month
- March
- Records since 2000
- 449
Cheilosia impressa
- Group
- True flies
- Peak month
- August
- Records since 2000
- 938
Cheilosia lasiopa
- Group
- True flies
- Peak month
- May
- Records since 2000
- 107
Cheilosia longula
- Group
- True flies
- Peak month
- July
- Records since 2000
- 92
Cheilosia morio
- Group
- True flies
- Peak month
- August
- Records since 2000
- 2,521
Cheilosia ranunculi
- Group
- True flies
- Peak month
- May
- Records since 2000
- 94
Cheilosia ruralis
- Group
- True flies
- Peak month
- April
- Records since 2000
- 61
Cheilosia scutellata
- Group
- True flies
- Peak month
- July
- Records since 2000
- 447
Cheilosia semifasciata
- Group
- True flies
- Peak month
- May
- Records since 2000
- 57
Cheilosia variabilis
- Group
- True flies
- Peak month
- May
- Records since 2000
- 1,169
Cheilosia vernalis
- Group
- True flies
- Peak month
- August
- Records since 2000
- 544
Cheilosia vulpina
- Group
- True flies
- Peak month
- August
- Records since 2000
- 164
Cheilothela chloropus
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 65
Cheilotrichia cinerascens
- Group
- True flies
- Peak month
- May
- Records since 2000
- 1,548
Cheilotrichia imbuta
- Group
- True flies
- Peak month
- June
- Records since 2000
- 135
Cheilymenia fimicola
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 187
Cheilymenia granulata
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 339
Cheilymenia stercorea
- Group
- Fungi
- Peak month
- March
- Records since 2000
- 70
Cheiracanthium erraticum
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 98
Cheirocratus assimilis
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 356
Cheirocratus intermedius
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 684
Cheirocratus sundevallii
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 2,128
Cheirospora botryospora
- Group
- Fungi
- Peak month
- February
- Records since 2000
- 89
Chelifera precatoria
- Group
- True flies
- Peak month
- June
- Records since 2000
- 120
Chelon ramada
- Group
- Fish
- Peak month
- October
- Records since 2000
- 403
Chelostoma florisomne
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 300
Chenault coralberry
- Group
- Flowering plants
- Peak month
- November
- Records since 2000
- 92
Chenopodium giganteum
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 230
Chequered Click Beetle
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 728
Chequered Fruit-tree Tortrix
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 1,522
Chequered Grass-veneer
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 1,380
Chequered Skipper
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 1,929
Chernes cimicoides
- Group
- Mites, harvestmen and other arachnids
- Peak month
- June
- Records since 2000
- 181
Cherry Gall
- Group
- Bees, wasps and ants
- Peak month
- September
- Records since 2000
- 723
Cherry Laurel
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 17,196
Cherry Plum
- Group
- Flowering plants
- Peak month
- March
- Records since 2000
- 4,436
Cherry slug sawfly
- Group
- Bees, wasps and ants
- Peak month
- September
- Records since 2000
- 383
Cherry-bark Moth
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 195
Cherrystone beetle
- Group
- Beetles
- Peak month
- September
- Records since 2000
- 2,072
Chersodromia incana
- Group
- True flies
- Peak month
- July
- Records since 2000
- 60
Chestnut
- Group
- Butterflies and moths
- Peak month
- October
- Records since 2000
- 3,800
Chestnut Rush
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 54
Chestnut Worm
- Group
- Worms (annelids)
- Peak month
- April
- Records since 2000
- 1,255
Chestnut wrinkle-lichen
- Group
- Lichens
- Peak month
- January
- Records since 2000
- 136
Cheumatopsyche lepida
- Group
- Caddisflies
- Peak month
- May
- Records since 2000
- 1,371
Chevron
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 1,213
Chia
- Group
- Flowering plants
- Peak month
- October
- Records since 2000
- 67
Chicken of The Woods
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 2,434
Chickweed Willowherb
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 66
Chicory
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 2,134
Childling pink
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 186
Chilean evening primrose
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 51
Chilean Sea Bass
- Group
- Fish
- Peak month
- June
- Records since 2000
- 193
Chilenocaecilius ornatipennis
- Group
- Other insects
- Peak month
- March
- Records since 2000
- 986
Chilo phragmitella
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 301
Chilodes maritima
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 315
Chiloe Wigeon
- Group
- Birds
- Peak month
- April
- Records since 2000
- 102
Chimarra marginata
- Group
- Caddisflies
- Peak month
- September
- Records since 2000
- 238
Chimney sponge
- Group
- Sponges
- Peak month
- May
- Records since 2000
- 1,897
Chimney Sweeper
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 2,975
China aster
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 99
China Limpet
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 516
Chinaman's Hat, Chinese hat
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 473
Chinese barberry
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 95
Chinese bramble
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 990
Chinese Character
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 2,203
Chinese Mitten Crab
- Group
- Crustaceans
- Peak month
- September
- Records since 2000
- 1,519
Chinese Muntjac
- Group
- Mammals
- Peak month
- April
- Records since 2000
- 20,457
Chinese silvergrass
- Group
- Flowering plants
- Peak month
- September
- Records since 2000
- 172
Chinese Water Deer
- Group
- Mammals
- Peak month
- April
- Records since 2000
- 941
Chinese windmill palm
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 142
Chionaspis salicis
- Group
- True bugs
- Peak month
- March
- Records since 2000
- 64
Chionoloma cylindrotheca
- Group
- Mosses
- Peak month
- September
- Records since 2000
- 396
Chionoloma hibernicum
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 203
Chip Cherries
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 662
Chippendale stubble
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 438
Chiridopsis bipunctata
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 231
Chironomus anthracinus
- Group
- True flies
- Peak month
- April
- Records since 2000
- 60
Chironomus aprilinus
- Group
- True flies
- Peak month
- May
- Records since 2000
- 100
Chironomus luridus
- Group
- True flies
- Peak month
- June
- Records since 2000
- 149
Chironomus plumosus
- Group
- True flies
- Peak month
- May
- Records since 2000
- 423
Chironomus salinarius
- Group
- True flies
- Peak month
- May
- Records since 2000
- 111
Chirosia albitarsis
- Group
- True flies
- Peak month
- May
- Records since 2000
- 78
Chirosia cinerosa
- Group
- True flies
- Peak month
- June
- Records since 2000
- 50
Chirosia flavipennis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 122
Chirosia grossicauda
- Group
- True flies
- Peak month
- August
- Records since 2000
- 835
Chirosia histricina
- Group
- True flies
- Peak month
- July
- Records since 2000
- 182
Chiseled Sunken Disk Lichen
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 2,040
Chives
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 396
Chlaenius nigricornis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 327
Chlaenius vestitus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 314
Chlamydatus evanescens
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 108
Chlorella sorokiniana
- Group
- Seaweeds and algae
- Peak month
- January
- Records since 2000
- 73
Chloriona dorsata
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 85
Chloriona glaucescens
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 130
Chloriona smaragdula
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 158
Chloriona unicolor
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 51
Chloriona vasconica
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 51
Chlorophyllum brunneum
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 141
Chlorophyllum olivieri
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 145
Chlorops calceatus
- Group
- True flies
- Peak month
- July
- Records since 2000
- 106
Chlorops hypostigma
- Group
- True flies
- Peak month
- August
- Records since 2000
- 311
Chlorops pumilionis
- Group
- True flies
- Peak month
- August
- Records since 2000
- 161
Chlorops scalaris
- Group
- True flies
- Peak month
- July
- Records since 2000
- 92
Chocolate arion
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 1,227
Chocolate chip lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 274
Chocolate chip lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 177