Babington's Orache
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 177
Babjevia anomala
- Group
- Fungi
- Peak month
- August
- Records since 2000
- 53
Baby Rose
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 196
Bachmanniomyces punctum
- Group
- Lichens
- Peak month
- October
- Records since 2000
- 52
Bacidia absistens
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 158
Bacidia arceutina
- Group
- Lichens
- Peak month
- July
- Records since 2000
- 286
Bacidia biatorina
- Group
- Lichens
- Peak month
- February
- Records since 2000
- 941
Bacidia squamellosa
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 102
Bacidina adastra
- Group
- Lichens
- Peak month
- February
- Records since 2000
- 113
Bacidina arnoldiana
- Group
- Lichens
- Peak month
- April
- Records since 2000
- 104
Bacidina chloroticula
- Group
- Lichens
- Peak month
- January
- Records since 2000
- 91
Bacidina delicata
- Group
- Lichens
- Peak month
- February
- Records since 2000
- 200
Bacidina egenula
- Group
- Lichens
- Peak month
- July
- Records since 2000
- 79
Bacidina inundata
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 133
Bacidina neosquamulosa
- Group
- Lichens
- Peak month
- March
- Records since 2000
- 115
Bacidina phacodes
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 299
Bacidina saxenii
- Group
- Lichens
- Peak month
- March
- Records since 2000
- 60
Bacidina sulphurella
- Group
- Lichens
- Peak month
- April
- Records since 2000
- 75
Bacon beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 190
Bacteriastrum hyalinum
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 51
Bactra furfurana
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 104
Bactridium flavum
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 84
Bactrospora corticola
- Group
- Lichens
- Peak month
- December
- Records since 2000
- 133
Badhamia utricularis
- Group
- Microorganisms and protists
- Peak month
- December
- Records since 2000
- 90
Badister bullatus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 1,593
Badister dilatatus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 203
Badister sodalis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 132
Badister unipustulatus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 60
Baeopelma foersteri
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 197
Baetis vernus
- Group
- Mayflies
- Peak month
- September
- Records since 2000
- 153
Baikal Teal
- Group
- Birds
- Peak month
- February
- Records since 2000
- 692
Baillon's Crake
- Group
- Birds
- Peak month
- September
- Records since 2000
- 77
Baillon's wrasse
- Group
- Fish
- Peak month
- March
- Records since 2000
- 316
Baird's Sandpiper
- Group
- Birds
- Peak month
- September
- Records since 2000
- 687
Baird’s slickhead, Baird's Smooth-head
- Group
- Fish
- Peak month
- September
- Records since 2000
- 492
Baked Bean Ascidian
- Group
- Sea squirts
- Peak month
- September
- Records since 2000
- 8,072
Baker's yeast
- Group
- Fungi
- Peak month
- August
- Records since 2000
- 540
Balanophyllia regia
- Group
- Jellyfish, corals and anemones
- Peak month
- July
- Records since 2000
- 91
Balclutha punctata
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 912
Balding Pincushion
- Group
- Mosses
- Peak month
- May
- Records since 2000
- 495
Balea heydeni
- Group
- Molluscs
- Peak month
- March
- Records since 2000
- 116
Balea perversa
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 183
Balea sarsii
- Group
- Molluscs
- Peak month
- July
- Records since 2000
- 1,070
Balearic Shearwater
- Group
- Birds
- Peak month
- August
- Records since 2000
- 4,086
Balkan Anemone
- Group
- Flowering plants
- Peak month
- March
- Records since 2000
- 202
Ball-tip lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 232
Ballan Wrasse
- Group
- Fish
- Peak month
- July
- Records since 2000
- 8,388
Ballus chalybeius
- Group
- Spiders
- Peak month
- May
- Records since 2000
- 104
Balm
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 4,147
Baltic Tellin
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 3,070
Baltimore Oriole
- Group
- Birds
- Peak month
- December
- Records since 2000
- 97
Bambusina borreri
- Group
- Seaweeds and algae
- Peak month
- July
- Records since 2000
- 58
Band-eyed Brown Horsefly
- Group
- True flies
- Peak month
- July
- Records since 2000
- 1,381
Band-rumped Storm Petrel
- Group
- Birds
- Peak month
- October
- Records since 2000
- 89
Banded carpet shell
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 3,253
Banded Centipede
- Group
- Centipedes
- Peak month
- April
- Records since 2000
- 687
Banded Chink Shell
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 1,118
Banded Comb-Footed Spider
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 569
Banded Demoiselle
- Group
- Dragonflies and damselflies
- Peak month
- June
- Records since 2000
- 75,531
Banded General
- Group
- True flies
- Peak month
- July
- Records since 2000
- 1,075
Banded house mosquito
- Group
- True flies
- Peak month
- July
- Records since 2000
- 2,143
Banded Mining Bee
- Group
- Bees, wasps and ants
- Peak month
- April
- Records since 2000
- 112
Banded Pill Beetle
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 63
Banded rhopalid
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 1,160
Banded Sexton Beetle
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 2,587
Banded venus
- Group
- Molluscs
- Peak month
- April
- Records since 2000
- 1,735
Banded Wedge-shell
- Group
- Molluscs
- Peak month
- June
- Records since 2000
- 973
Bangia atropurpurea
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 82
Bank Haircap
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 18,136
Bank Swallow
- Group
- Birds
- Peak month
- April
- Records since 2000
- 173,157
Bank Vole
- Group
- Mammals
- Peak month
- September
- Records since 2000
- 3,619
Bantry Notchwort
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 617
Bar-headed Goose
- Group
- Birds
- Peak month
- August
- Records since 2000
- 2,106
Bar-tailed Godwit
- Group
- Birds
- Peak month
- September
- Records since 2000
- 65,771
Barbel
- Group
- Fish
- Peak month
- September
- Records since 2000
- 1,326
Barberry
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 163
Barbilophozia hatcheri
- Group
- Liverworts
- Peak month
- June
- Records since 2000
- 404
Barbilophozia lycopodioides
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 72
Bare Footed Heart Shield
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 993
Bare-saddled Blood Bee
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 706
Bare-winged Halfband
- Group
- True flies
- Peak month
- August
- Records since 2000
- 700
Bark Barnacles
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 3,317
Bark Bonnet
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,019
Bark lice
- Group
- Other insects
- Peak month
- October
- Records since 2000
- 908
Bark lice
- Group
- Other insects
- Peak month
- September
- Records since 2000
- 546
Bark lice
- Group
- Other insects
- Peak month
- May
- Records since 2000
- 493
Bark scribble
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 942
Barn Funnel Weaver
- Group
- Spiders
- Peak month
- July
- Records since 2000
- 68
Barn Owl
- Group
- Birds
- Peak month
- January
- Records since 2000
- 54,544
Barn Swallow
- Group
- Birds
- Peak month
- May
- Records since 2000
- 508,854
Barnacle Goose
- Group
- Birds
- Peak month
- October
- Records since 2000
- 47,758
Barnacle-eating onchidoris
- Group
- Molluscs
- Peak month
- July
- Records since 2000
- 535
Barnea candida
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 362
Barnea parva
- Group
- Molluscs
- Peak month
- March
- Records since 2000
- 105
Barracudina
- Group
- Fish
- Peak month
- April
- Records since 2000
- 104
Barred chestnut
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 350
Barred Fruit-tree Tortrix
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 2,442
Barred Grass-veneer
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 863
Barred hook-tip
- Group
- Butterflies and moths
- Peak month
- May
- Records since 2000
- 199
Barred Marble
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 2,725
Barred Red
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 834
Barred rivulet
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 192
Barred Sallow
- Group
- Butterflies and moths
- Peak month
- October
- Records since 2000
- 1,438
Barred Snout
- Group
- True flies
- Peak month
- July
- Records since 2000
- 811
Barred Tooth-striped
- Group
- Butterflies and moths
- Peak month
- April
- Records since 2000
- 52
Barred umber
- Group
- Butterflies and moths
- Peak month
- May
- Records since 2000
- 258
Barred Warbler
- Group
- Birds
- Peak month
- September
- Records since 2000
- 2,598
Barred Yellow
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 1,357
Barrel Jelly
- Group
- Jellyfish, corals and anemones
- Peak month
- September
- Records since 2000
- 487
Barrel jellyfish
- Group
- Jellyfish, corals and anemones
- Peak month
- September
- Records since 2000
- 641
Barren Brome
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 6,383
Barren Strawberry
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 6,239
Barrow's Goldeneye
- Group
- Birds
- Peak month
- May
- Records since 2000
- 117
Barylypa propugnator
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 68
Barynotus moerens
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 254
Barynotus obscurus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 309
Barynotus squamosus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 60
Baryphyma maritimum
- Group
- Spiders
- Peak month
- July
- Records since 2000
- 74
Baryphyma trifrons
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 212
Basalys formicarium
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 214
Basil Thyme
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 184
Basket of gold
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 150
Basking Shark
- Group
- Fish
- Peak month
- August
- Records since 2000
- 10,066
Bastard Balm
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 195
Bastard-toadflax
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 222
Batfish
- Group
- Fish
- Peak month
- July
- Records since 2000
- 77
Bathymedon longimanus
- Group
- Crustaceans
- Peak month
- October
- Records since 2000
- 63
Bathyphantes approximatus
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 278
Bathyphantes nigrinus
- Group
- Spiders
- Peak month
- September
- Records since 2000
- 105
Bathyphantes parvulus
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 152
Bathyporeia gracilis
- Group
- Crustaceans
- Peak month
- February
- Records since 2000
- 246
Bathyporeia guilliamsoniana
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 2,395
Bathyporeia nana
- Group
- Crustaceans
- Peak month
- April
- Records since 2000
- 258
Bathyporeia pilosa
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 814
Bathyporeia sarsi
- Group
- Crustaceans
- Peak month
- September
- Records since 2000
- 792
Bathyporeia tenuipes
- Group
- Crustaceans
- Peak month
- April
- Records since 2000
- 1,536
Bathythrix pellucidator
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 99
Bathythrix prominens
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 65
Batman Hoverfly
- Group
- True flies
- Peak month
- August
- Records since 2000
- 21,723
Batophila aerata
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 79
Batrachedra praeangusta
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 163
Bay
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 481
Bay Bolete
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,589
Bay Polypore
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 700
Bay Willow
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 265
Bazzania pearsonii
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 140
Bdellovibrio bacteriovorus
- Group
- Microorganisms and protists
- Peak month
- January
- Records since 2000
- 76
Beach morning glory
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 600
Beaded Chestnut
- Group
- Butterflies and moths
- Peak month
- October
- Records since 2000
- 2,359
Beadlet Anemone
- Group
- Jellyfish, corals and anemones
- Peak month
- August
- Records since 2000
- 7,465
Beaked Beardless-moss
- Group
- Mosses
- Peak month
- October
- Records since 2000
- 162
Beaked Bow-moss
- Group
- Mosses
- Peak month
- September
- Records since 2000
- 851
Beaked Corydalis
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 3,624
Beaked Hawk's-beard
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 1,455
Beaked Tasselweed
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 211
Bean Aphid
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 673
Bean Beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 889
Bean Horse-mussel
- Group
- Molluscs
- Peak month
- March
- Records since 2000
- 727
Bean Seed Maggot
- Group
- True flies
- Peak month
- July
- Records since 2000
- 1,393
Bean-Like Tellin
- Group
- Molluscs
- Peak month
- June
- Records since 2000
- 5,883
Beania mirabilis
- Group
- Bryozoans
- Peak month
- September
- Records since 2000
- 360
Beanweed
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 517
Bear's breeches
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 258
Bear's-breech
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 1,099
Bearberry
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 230
Bearberry cotoneaster
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 201
Bearbind
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 6,477
Beard lichen
- Group
- Lichens
- Peak month
- March
- Records since 2000
- 1,554
Beard lichen
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 453
Beard lichen
- Group
- Lichens
- Peak month
- October
- Records since 2000
- 376
Beard lichen
- Group
- Lichens
- Peak month
- July
- Records since 2000
- 54
Bearded Couch
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 942
Bearded horse-mussel
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 56
Bearded iris
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 92
Bearded Miner Bee
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 877
Bearded Pawwort
- Group
- Liverworts
- Peak month
- April
- Records since 2000
- 545
Bearded Reedling
- Group
- Birds
- Peak month
- May
- Records since 2000
- 33,456
Bearded Seamine
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 127
Bearded Vulture
- Group
- Birds
- Peak month
- July
- Records since 2000
- 287
Beautiful carpet
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 303
Beautiful China-mark
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 572
Beautiful Damselfly
- Group
- Dragonflies and damselflies
- Peak month
- June
- Records since 2000
- 33,565
Beautiful Golden Y
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 2,847
Beautiful grass snail
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 197
Beautiful Hook-tip
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 2,206
Beautiful Plume
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 2,457
Beautiful snout
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 159
Beauveria bassiana
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 57
Bechstein's Bat
- Group
- Mammals
- Peak month
- January
- Records since 2000
- 257
Bedeguar Gall Causer
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 2,311
Bee Beetle
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 795
Bee Fly
- Group
- True flies
- Peak month
- April
- Records since 2000
- 32,811
Bee Moth
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 5,916
Bee Orchid
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 6,503
Bee spionid
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 16,276
Bee Wolf
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 1,877
Beech
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 26,555
Beech Barkspot
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 799
Beech Feather-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 2,764
Beech Fern
- Group
- Ferns and horsetails
- Peak month
- July
- Records since 2000
- 770
Beech Jellydisc
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 507
Beech Leaf Miner
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 789
Beech Leafminer
- Group
- Butterflies and moths
- Peak month
- October
- Records since 2000
- 698
Beech Milkcap
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,255
Beech Scale
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 71
Beech Tarcrust
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 732
Beech Woodwart
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,842
Beech-green carpet
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 103
Beechmast Candlesnuff
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 1,134
Beechwood Sickener
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,021
Beefsteak Fungus
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 1,535
Beerbarrel Shell
- Group
- Molluscs
- Peak month
- July
- Records since 2000
- 633
Beet Carrion Beetle
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 63
Beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 586
Beggarticks
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 131
Beige Fibrecap
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 476
Bela nebula
- Group
- Molluscs
- Peak month
- April
- Records since 2000
- 369
Bell Heather
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 7,603
Bellardia pandia
- Group
- True flies
- Peak month
- July
- Records since 2000
- 104
Bellardia viscosa
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 292
Bellardia vulgaris
- Group
- True flies
- Peak month
- July
- Records since 2000
- 381
Bellerochea horologicalis
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 64
Bellerochea malleus
- Group
- Seaweeds and algae
- Peak month
- October
- Records since 2000
- 326
Bellicidia incompta
- Group
- Lichens
- Peak month
- March
- Records since 2000
- 511
Belted Beauty
- Group
- Butterflies and moths
- Peak month
- April
- Records since 2000
- 590
Belted click beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 627
Belted Kingfisher
- Group
- Birds
- Peak month
- December
- Records since 2000
- 230
Belted Springtail
- Group
- Springtails
- Peak month
- October
- Records since 2000
- 2,782
Belyta depressa
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 184
Belyta sanguinolenta
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 167
Belyta validicornis
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 88
Bembecia ichneumoniformis
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 179
Bembidion aeneum
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 739
Bembidion articulatum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 788
Bembidion assimile
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 1,216
Bembidion atrocaeruleum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 926
Bembidion biguttatum
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 1,566
Bembidion bruxellense
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 143
Bembidion bualei
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 75
Bembidion clarkii
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 306
Bembidion decorum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 761
Bembidion deletum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 350
Bembidion dentellum
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 828
Bembidion doris
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 376
Bembidion ephippium
- Group
- Beetles
- Peak month
- September
- Records since 2000
- 76
Bembidion femoratum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 351
Bembidion fumigatum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 219
Bembidion genei
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 96
Bembidion geniculatum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 64
Bembidion gilvipes
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 296
Bembidion illigeri
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 96
Bembidion iricolor
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 191
Bembidion laterale
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 58
Bembidion litorale
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 135
Bembidion lunulatum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 2,118
Bembidion mannerheimii
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 850
Bembidion minimum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 565
Bembidion monticola
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 66
Bembidion normannum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 354
Bembidion obliquum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 201
Bembidion octomaculatum
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 78
Bembidion pallidipenne
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 142
Bembidion prasinum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 113
Bembidion punctulatum
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 751
Bembidion saxatile
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 136
Bembidion stephensii
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 83
Bembidion tibiale
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 710
Bembidion varium
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 819
Bena bicolorana
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 405
Bendy Ditrichum
- Group
- Mosses
- Peak month
- April
- Records since 2000
- 303
Bent crisp-moss
- Group
- Mosses
- Peak month
- May
- Records since 2000
- 107
Bent-moss
- Group
- Mosses
- Peak month
- December
- Records since 2000
- 92
Bentnose Rabbitfish, Bigspine Spookfish, Longnose Chimaera, Long-nosed Chimaera, Longnosed Chimaera, Narrownose Chimaera
- Group
- Fish
- Peak month
- September
- Records since 2000
- 293
Beosus maritimus
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 146
Beraea maurus
- Group
- Caddisflies
- Peak month
- July
- Records since 2000
- 1,639
Beraea pullata
- Group
- Caddisflies
- Peak month
- June
- Records since 2000
- 847
Beraeodes minutus
- Group
- Caddisflies
- Peak month
- October
- Records since 2000
- 647
Berberis hortensis
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 181
Bereft scavenger beetle
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 72
Beringius turtoni
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 107
Beris clavipes
- Group
- True flies
- Peak month
- May
- Records since 2000
- 155
Bermuda buttercup
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 91
Bermuda grass
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 78
Beroe cucumis
- Group
- Other invertebrates
- Peak month
- June
- Records since 2000
- 158
Berosus affinis
- Group
- Beetles
- Peak month
- September
- Records since 2000
- 351
Berosus signaticollis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 126
Berthella plumula
- Group
- Molluscs
- Peak month
- April
- Records since 2000
- 198
Bertia moriformis
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 145
Bertkauia lucifuga
- Group
- Other insects
- Peak month
- August
- Records since 2000
- 71
Bertoloni's timothy
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 2,007
Berytinus minor
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 139
Berytinus signoreti
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 92
Beta maritima
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 1,064
Bethylus cephalotes
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 108
Betony
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 4,042
Biatora britannica
- Group
- Lichens
- Peak month
- February
- Records since 2000
- 219
Biatora chrysantha
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 104
Biatora epixanthoides
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 631
Biatoropsis usnearum
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 172
Bibio anglicus
- Group
- True flies
- Peak month
- April
- Records since 2000
- 200
Bibio hortulanus
- Group
- True flies
- Peak month
- May
- Records since 2000
- 106
Bibio lanigerus
- Group
- True flies
- Peak month
- April
- Records since 2000
- 615
Bibio lepidus
- Group
- True flies
- Peak month
- October
- Records since 2000
- 95
Bibio leucoptera
- Group
- True flies
- Peak month
- May
- Records since 2000
- 388
Bibio longipes
- Group
- True flies
- Peak month
- September
- Records since 2000
- 92
Bibio nigriventris
- Group
- True flies
- Peak month
- May
- Records since 2000
- 137
Bibio varipes
- Group
- True flies
- Peak month
- May
- Records since 2000
- 186
Bicellaria intermedia
- Group
- True flies
- Peak month
- August
- Records since 2000
- 164
Bicellaria nigra
- Group
- True flies
- Peak month
- July
- Records since 2000
- 57
Bicellaria vana
- Group
- True flies
- Peak month
- June
- Records since 2000
- 439
Bicolor sedge
- Group
- Caddisflies
- Peak month
- June
- Records since 2000
- 998
Biddulphia sinensis
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 1,445
Bifid Crestwort
- Group
- Liverworts
- Peak month
- March
- Records since 2000
- 23,907
Bifid Hemp-nettle
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 520
Big salted-ruffle
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 1,214
Big Shaggy-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 8,933
Big sheath mushroom
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 734
Bigeye
- Group
- Fish
- Peak month
- September
- Records since 2000
- 67
Bigeye Rockling, Rockling
- Group
- Fish
- Peak month
- November
- Records since 2000
- 67
Bigeye tuna
- Group
- Fish
- Peak month
- February
- Records since 2000
- 123
Bighead knapweed
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 426
Bigleaf lupine
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 112
Bilbao Fleabane
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 643
Bilberry
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 18,150
Bilberry pug
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 78
Bilimbia lobulata
- Group
- Lichens
- Peak month
- November
- Records since 2000
- 56
Bimastos eiseni
- Group
- Worms (annelids)
- Peak month
- November
- Records since 2000
- 278
Biocular leech
- Group
- Worms (annelids)
- Peak month
- September
- Records since 2000
- 606
Bionectria ralfsii
- Group
- Fungi
- Peak month
- February
- Records since 2000
- 109
Biphyllus lunatus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 251
Birch Besom
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 745
Birch Brittlegill
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,025
Birch catkin bug
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 5,955
Birch Catkin Weevil
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 520
Birch Clubhorn
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 487
Birch Knight
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 771
Birch leaf miner
- Group
- True flies
- Peak month
- July
- Records since 2000
- 66
Birch Leafminer
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 165
Birch Marble
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 537
Birch Milkcap
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,345
Birch mocha
- Group
- Butterflies and moths
- Peak month
- May
- Records since 2000
- 417
Birch Rust
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 552
Birch Shieldbug
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 10,114
Birch Woodwart
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 2,111
Birchbark dot lichen
- Group
- Fungi
- Peak month
- July
- Records since 2000
- 126
Birchbark dot lichen
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 89
Bird Cherry
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 5,516
Bird cherry-oat aphid
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 796
Bird's-claw Beard-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 19,787
Bird's-eye Primrose
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 413
Bird's-eye Primrose Smut
- Group
- Fungi
- Peak month
- July
- Records since 2000
- 111
Bird's-foot
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 1,146
Bird's-foot Clover
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 128
Bird's-foot Sedge
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 57
Bird's-foot Wing-moss
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 863
Bird's-nest Moth
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 683
Bird's-nest Orchid
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 509
Bird-cherry Ermine
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 3,083
Bird-in-a-bush
- Group
- Flowering plants
- Peak month
- March
- Records since 2000
- 88
Birdbeak Dogfish
- Group
- Fish
- Peak month
- April
- Records since 2000
- 767
Birds wing
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 392
Birka cinereipes
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 71
Bischoff's rinodina lichen
- Group
- Lichens
- Peak month
- July
- Records since 2000
- 60
Biscuit beetle
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 78
Bishop's Mitre
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 5,769
Bishopsweed
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 63
Bisnius fimetarius
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 152
Bisnius sordidus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 74
Bistorta affinis
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 74
Bistorta amplexicaulis
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 270
Bithia spreta
- Group
- True flies
- Peak month
- July
- Records since 2000
- 249
Bithynian Vetch
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 58
Biting Stonecrop
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 3,420
Bitoma crenata
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 425
Bitter Beech Bolete
- Group
- Fungi
- Peak month
- August
- Records since 2000
- 181
Bitter Bolete
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 186
Bitter Bracket
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 519
Bitter Chocolate Rust
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 526
Bitter fluff-wart
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 2,956
Bitter Oysterling
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 821
Bitter Scalewort
- Group
- Liverworts
- Peak month
- March
- Records since 2000
- 596
Bitter-vetch
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 2,120
Bitterling
- Group
- Fish
- Peak month
- September
- Records since 2000
- 286
Bitterling
- Group
- Fish
- Peak month
- September
- Records since 2000
- 122
Bittersweet
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 14,056
Bittium reticulatum
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 226
Bjerkandera fumosa
- Group
- Fungi
- Peak month
- November
- Records since 2000
- 139
Black Arches
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 2,283
Black Arion
- Group
- Molluscs
- Peak month
- June
- Records since 2000
- 4,041
Black bamboo
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 62
Black Bent
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 637
Black Bog-rush
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 696
Black Brittlestar
- Group
- Starfish and sea urchins
- Peak month
- September
- Records since 2000
- 4,267
Black Bryony
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 7,792
Black Bulgar
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,020
Black Cherry Aphid
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 411
Black Clock
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 8,199
Black Colonel
- Group
- True flies
- Peak month
- June
- Records since 2000
- 761
Black Crowberry
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 5,057
Black Crystalwort
- Group
- Liverworts
- Peak month
- February
- Records since 2000
- 83
Black Currant
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 988
Black Darter
- Group
- Dragonflies and damselflies
- Peak month
- August
- Records since 2000
- 26,741
Black Dogfish
- Group
- Fish
- Peak month
- September
- Records since 2000
- 331
Black Duck
- Group
- Birds
- Peak month
- October
- Records since 2000
- 197
Black Gnat
- Group
- True flies
- Peak month
- April
- Records since 2000
- 948
Black Goby
- Group
- Fish
- Peak month
- September
- Records since 2000
- 1,332
Black golf club moss
- Group
- Mosses
- Peak month
- November
- Records since 2000
- 98
Black Grimmia
- Group
- Mosses
- Peak month
- June
- Records since 2000
- 173
Black grouse
- Group
- Birds
- Peak month
- April
- Records since 2000
- 7,389
Black Guillemot
- Group
- Birds
- Peak month
- May
- Records since 2000
- 27,934
Black Headed Mason Wasp
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 89
Black Horehound
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 6,109
Black jointed coralline
- Group
- Bryozoans
- Peak month
- August
- Records since 2000
- 618
Black Kite
- Group
- Birds
- Peak month
- April
- Records since 2000
- 511
Black lace-weaver
- Group
- Spiders
- Peak month
- April
- Records since 2000
- 272
Black Lark
- Group
- Birds
- Peak month
- June
- Records since 2000
- 118
Black Lichen
- Group
- Lichens
- Peak month
- September
- Records since 2000
- 1,679
Black Locust Gall Midge
- Group
- True flies
- Peak month
- September
- Records since 2000
- 176
Black Marram Weevil
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 526
Black Medick
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 10,508
Black mold
- Group
- Fungi
- Peak month
- August
- Records since 2000
- 548
Black moss beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 294
Black Mulberry
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 117
Black Mustard
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 540
Black Needle Fly
- Group
- Stoneflies
- Peak month
- April
- Records since 2000
- 634
Black Nightshade
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 3,192
Black Orangeband Sawfly
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 502
Black Plant Bug
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 2,287
Black Redstart
- Group
- Birds
- Peak month
- October
- Records since 2000
- 15,620
Black Rock-moss
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 3,150
Black Rustic
- Group
- Butterflies and moths
- Peak month
- October
- Records since 2000
- 3,938
Black Scabbardfish
- Group
- Fish
- Peak month
- September
- Records since 2000
- 394
Black seabream
- Group
- Fish
- Peak month
- October
- Records since 2000
- 3,860
Black Sexton Beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 4,980
Black Snipefly
- Group
- True flies
- Peak month
- June
- Records since 2000
- 8,496
Black Spleenwort
- Group
- Ferns and horsetails
- Peak month
- April
- Records since 2000
- 2,423
Black spotted ground beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 1,991
Black Stone Flower
- Group
- Lichens
- Peak month
- March
- Records since 2000
- 4,349
Black Stork
- Group
- Birds
- Peak month
- August
- Records since 2000
- 630
Black Swan
- Group
- Birds
- Peak month
- May
- Records since 2000
- 9,552
Black tar sponge
- Group
- Sponges
- Peak month
- September
- Records since 2000
- 1,043
Black Tern
- Group
- Birds
- Peak month
- September
- Records since 2000
- 10,051
Black Walnut
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 76
Black-beaked green weevil
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 608
Black-bellied Plover
- Group
- Birds
- Peak month
- October
- Records since 2000
- 59,861
Black-bindweed
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 1,481
Black-blotched Bactra Moth
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 1,230
Black-bordered Shingle Lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 1,498
Black-browed Albatross
- Group
- Birds
- Peak month
- July
- Records since 2000
- 1,088
Black-crowned Night-Heron
- Group
- Birds
- Peak month
- April
- Records since 2000
- 1,194
Black-eye Lichen
- Group
- Lichens
- Peak month
- July
- Records since 2000
- 3,474
Black-faced Blenny
- Group
- Fish
- Peak month
- July
- Records since 2000
- 185
Black-faced bunting
- Group
- Birds
- Peak month
- October
- Records since 2000
- 82
Black-footed limpet
- Group
- Molluscs
- Peak month
- October
- Records since 2000
- 340
Black-grass
- Group
- Flowering plants
- Peak month
- October
- Records since 2000
- 1,597
Black-grass
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 1,086
Black-Headed Bunting
- Group
- Birds
- Peak month
- June
- Records since 2000
- 136
Black-headed Cardinal Beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 1,862
Black-headed cymus
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 1,106
Black-headed Gull
- Group
- Birds
- Peak month
- January
- Records since 2000
- 1,071,610
Black-horned Cleg
- Group
- True flies
- Peak month
- June
- Records since 2000
- 743
Black-horned Smoothtail
- Group
- True flies
- Peak month
- July
- Records since 2000
- 2,911
Black-kneed Apple Capsid
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 974
Black-kneed Fen Fly
- Group
- True flies
- Peak month
- July
- Records since 2000
- 2,014
Black-legged ham beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 62
Black-legged Kittiwake
- Group
- Birds
- Peak month
- June
- Records since 2000
- 94,955
Black-lined periwinkle
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 136
Black-margined Loosestrife Beetle
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 169
Black-poplar
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 2,002
Black-punctured leaf beetle
- Group
- Beetles
- Peak month
- September
- Records since 2000
- 479
Black-streaked dung beetle
- Group
- Beetles
- Peak month
- September
- Records since 2000
- 660
Black-striped cranefly
- Group
- True flies
- Peak month
- May
- Records since 2000
- 3,421
Black-tailed Aphideater
- Group
- True flies
- Peak month
- April
- Records since 2000
- 6,458
Black-tailed Godwit
- Group
- Birds
- Peak month
- August
- Records since 2000
- 167,241
Black-tailed Skimmer
- Group
- Dragonflies and damselflies
- Peak month
- July
- Records since 2000
- 54,605
Black-throated Dark-throated Thrush
- Group
- Birds
- Peak month
- December
- Records since 2000
- 411
Black-tufted Moss
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 465
Black-winged Kite
- Group
- Birds
- Peak month
- July
- Records since 2000
- 256
Black-Winged Pratincole
- Group
- Birds
- Peak month
- July
- Records since 2000
- 370
Black-winged Stilt
- Group
- Birds
- Peak month
- August
- Records since 2000
- 956
Blackbellied angler
- Group
- Fish
- Peak month
- November
- Records since 2000
- 3,987
Blackbelly rosefish, Blue-mouth
- Group
- Fish
- Peak month
- September
- Records since 2000
- 16,411
Blackberry
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 486
Blackburnian Warbler
- Group
- Birds
- Peak month
- October
- Records since 2000
- 100
Blackchin Dolphin
- Group
- Mammals
- Peak month
- October
- Records since 2000
- 74
Blackcurly lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 154
Blackedge Bonnet
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 551
Blackening Waxcap
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 4,612
Blackeyed Susan
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 56
Blackfish
- Group
- Mammals
- Peak month
- October
- Records since 2000
- 74
Blackfoot Polypore
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 1,153
Blackish Puffball
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,080
Blackish-Purple Russula
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,374
Blackmouth catshark, Black-mouthed Dogfish
- Group
- Fish
- Peak month
- November
- Records since 2000
- 3,526
Blackneck
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 365
Blackpoll Warbler
- Group
- Birds
- Peak month
- October
- Records since 2000
- 125
Blackthorn
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 28,574
Blackthread Lichen
- Group
- Lichens
- Peak month
- July
- Records since 2000
- 1,151
Blackthread lichen
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 66
Bladder Campion
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 2,695
Bladder Wrack
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 12,111
Bladder-sedge
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 347
Bladdernut
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 148
Bladderwort
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 53
Blaesoxipha plumicornis
- Group
- True flies
- Peak month
- July
- Records since 2000
- 228
Blair's Shoulder-Knot
- Group
- Butterflies and moths
- Peak month
- October
- Records since 2000
- 1,707
Blaps mucronata
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 107
Blapstinus metallicus
- Group
- Beetles
- Peak month
- March
- Records since 2000
- 81
Blastenia crenularia
- Group
- Lichens
- Peak month
- July
- Records since 2000
- 1,210
Blastenia ferruginea
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 338
Bleak
- Group
- Fish
- Peak month
- June
- Records since 2000
- 68
Bledius gallicus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 86
Bledius longulus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 186
Bledius opacus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 56
Bledius spectabilis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 53
Bledius subterraneus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 140
Bleeding Bonnet
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 459
Bleeding Broadleaf Crust
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,994
Bleeding Conifer Crust
- Group
- Fungi
- Peak month
- November
- Records since 2000
- 547
Bleeding Oak Crust
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 1,024
Blemished lichen
- Group
- Lichens
- Peak month
- January
- Records since 2000
- 242
Blepharipa pratensis
- Group
- True flies
- Peak month
- May
- Records since 2000
- 90
Blethisa multipunctata
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 102
Blidingia marginata
- Group
- Seaweeds and algae
- Peak month
- June
- Records since 2000
- 124
Blidingia minima
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 160
Blindeyes
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 1,128
Blindiadelphus recurvatus
- Group
- Mosses
- Peak month
- April
- Records since 2000
- 452
Blinks [Montia fontana]
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 1,468
Blistered jelly lichen; Jelly lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 91
Blistered navel lichen
- Group
- Lichens
- Peak month
- September
- Records since 2000
- 228
Blonde ray
- Group
- Fish
- Peak month
- September
- Records since 2000
- 7,660
Blonde Ray
- Group
- Fish
- Peak month
- May
- Records since 2000
- 1,004
Blondelia nigripes
- Group
- True flies
- Peak month
- July
- Records since 2000
- 57
Blood Star
- Group
- Starfish and sea urchins
- Peak month
- August
- Records since 2000
- 760
Blood whiskers
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 1,120
Blood-vein
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 2,838
Bloodworm
- Group
- Worms (annelids)
- Peak month
- April
- Records since 2000
- 1,437
Bloody Comma Lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 1,118
Bloody Crane's-bill
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 3,916
Bloody Cranesbill Weevil
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 104
Bloody Heart Lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 864
Bloody Henry Starfish
- Group
- Starfish and sea urchins
- Peak month
- June
- Records since 2000
- 3,630
Bloody-nosed Beetle
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 2,765
Bloomed Furrow Bee
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 1,131
Blossom underwing
- Group
- Butterflies and moths
- Peak month
- April
- Records since 2000
- 51
Blotch-winged Hoverfly
- Group
- True flies
- Peak month
- May
- Records since 2000
- 4,060
Blotched Emerald
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 519
Blow Fly
- Group
- True flies
- Peak month
- August
- Records since 2000
- 1,486
Blow fly
- Group
- True flies
- Peak month
- July
- Records since 2000
- 911
Blow Lug, Lugworm, Lobworm
- Group
- Worms (annelids)
- Peak month
- August
- Records since 2000
- 5,017
Blue anemone
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 115
Blue Antimora
- Group
- Fish
- Peak month
- April
- Records since 2000
- 118
Blue bottle fly
- Group
- True flies
- Peak month
- July
- Records since 2000
- 1,147
Blue Bug
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 1,877
Blue Carpenter Bee
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 86
Blue Crystalwort
- Group
- Liverworts
- Peak month
- April
- Records since 2000
- 108
Blue Edge Pinkgill
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 523
Blue Felt Lichen
- Group
- Lichens
- Peak month
- March
- Records since 2000
- 631
Blue Fescue
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 58
Blue Fleabane
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 937
Blue Ground Beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 259
Blue gum
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 53
Blue Jellyfish
- Group
- Jellyfish, corals and anemones
- Peak month
- July
- Records since 2000
- 1,937
Blue Jellyskin Lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 607
Blue Ling
- Group
- Fish
- Peak month
- April
- Records since 2000
- 442
Blue Ling
- Group
- Fish
- Peak month
- November
- Records since 2000
- 205
Blue Moor-grass
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 440
Blue rayed limpet
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 2,309
Blue Rock Thrush
- Group
- Birds
- Peak month
- December
- Records since 2000
- 184
Blue Roundhead
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 621
Blue Shark
- Group
- Fish
- Peak month
- July
- Records since 2000
- 189
Blue skate
- Group
- Fish
- Peak month
- November
- Records since 2000
- 11,417
Blue verbena
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 103
Blue Water-speedwell
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 687
Blue whiting
- Group
- Fish
- Peak month
- November
- Records since 2000
- 34,871
Blue Willow Beetle
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 479
Blue-bordered Carpet
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 590
Blue-eyed-Mary
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 215
Blue-gray Rosette Lichen
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 3,454
Blue-gray Sunken-disk
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 793
Blue-grey hellebore
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 121
Blue-grey Worm
- Group
- Worms (annelids)
- Peak month
- April
- Records since 2000
- 463
Blue-tailed Damselfly
- Group
- Dragonflies and damselflies
- Peak month
- June
- Records since 2000
- 144,041
Blue-winged Olive
- Group
- Mayflies
- Peak month
- September
- Records since 2000
- 3,275
Blue-winged Teal
- Group
- Birds
- Peak month
- April
- Records since 2000
- 714
Bluebell
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 17,510
Bluebell Rust
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 710
Bluebell rust
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 522
Bluecrown passionflower
- Group
- Flowering plants
- Peak month
- October
- Records since 2000
- 55
Bluefoot bolete
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 732
Bluehead gilia
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 56
Blueing Bracket
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 848
Blueish Veilwort
- Group
- Liverworts
- Peak month
- March
- Records since 2000
- 10,650
Bluethroat
- Group
- Birds
- Peak month
- May
- Records since 2000
- 1,806
Bluetongue virus
- Group
- Microorganisms and protists
- Peak month
- September
- Records since 2000
- 210
Blunt Cord-moss
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 979
Blunt Feather-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 3,573
Blunt Gaper
- Group
- Molluscs
- Peak month
- July
- Records since 2000
- 3,945
Blunt tellin
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 1,024
Blunt-flowered Rush
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 1,718