Kaestneria dorsalis
- Group
- Spiders
- Peak month
- May
- Records since 2000
- 66
Kaestneria pullata
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 216
Kageronia fuscogrisea
- Group
- Mayflies
- Peak month
- May
- Records since 2000
- 60
Kallymenia reniformis
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 823
Kandaea elodes
- Group
- Mosses
- Peak month
- May
- Records since 2000
- 210
Karayevia clevei
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 54
Karenia mikimotoi
- Group
- Microorganisms and protists
- Peak month
- July
- Records since 2000
- 177
Karstenia rhopaloides
- Group
- Lichens
- Peak month
- January
- Records since 2000
- 100
Kateretes pedicularius
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 123
Kateretes pusillus
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 114
Kateretes rufilabris
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 259
Kaup's Arrowtooth Eel, Gray's Cutthroat, Longnosed Eel, Long-nose Eel, Northern Cutthroat Eel, Slatjaw Cutthroat Eel
- Group
- Fish
- Peak month
- September
- Records since 2000
- 212
Keeled Ramshorn
- Group
- Molluscs
- Peak month
- July
- Records since 2000
- 1,813
Keeled Skimmer
- Group
- Dragonflies and damselflies
- Peak month
- July
- Records since 2000
- 18,845
Keeled Slug
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 606
Keeled-fruited Cornsalad
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 278
Kefersteinia cirrhata
- Group
- Worms (annelids)
- Peak month
- July
- Records since 2000
- 854
Kelisia sabulicola
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 116
Kelp Gull
- Group
- Birds
- Peak month
- August
- Records since 2000
- 283
Kentish Glory
- Group
- Butterflies and moths
- Peak month
- April
- Records since 2000
- 463
Kentish Plover
- Group
- Birds
- Peak month
- May
- Records since 2000
- 609
Kentish Snail
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 7,788
Kerria
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 164
Kidney Vetch
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 5,335
Kidney-spot Ladybird
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 3,907
Kidneybean Thracia
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 3,554
Kiefferia pericarpiicola
- Group
- True flies
- Peak month
- August
- Records since 2000
- 71
Kiefferulus tendipediformis
- Group
- True flies
- Peak month
- July
- Records since 2000
- 83
Kiliasia episema
- Group
- Lichens
- Peak month
- November
- Records since 2000
- 78
Killarney Featherwort
- Group
- Liverworts
- Peak month
- February
- Records since 2000
- 1,485
Killdeer
- Group
- Birds
- Peak month
- April
- Records since 2000
- 97
Killer shrimp
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 539
Killer Whale
- Group
- Mammals
- Peak month
- November
- Records since 2000
- 75
King Alfred's Cakes
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 4,250
King/Common Eider
- Group
- Birds
- Peak month
- April
- Records since 2000
- 1,026
Kirchneriella aperta
- Group
- Seaweeds and algae
- Peak month
- January
- Records since 2000
- 130
Kirkegaardia dorsobranchialis
- Group
- Worms (annelids)
- Peak month
- April
- Records since 2000
- 1,359
Kite-tailed Robberfly
- Group
- True flies
- Peak month
- August
- Records since 2000
- 4,398
Klebsiella michiganensis
- Group
- Microorganisms and protists
- Peak month
- October
- Records since 2000
- 122
Klebsiella ornithinolytica
- Group
- Microorganisms and protists
- Peak month
- September
- Records since 2000
- 103
Klebsiella oxytoca
- Group
- Microorganisms and protists
- Peak month
- December
- Records since 2000
- 115
Klebsiella planticola
- Group
- Microorganisms and protists
- Peak month
- June
- Records since 2000
- 102
Klebsiella quasipneumoniae
- Group
- Microorganisms and protists
- Peak month
- November
- Records since 2000
- 106
Klebsiella variicola
- Group
- Microorganisms and protists
- Peak month
- November
- Records since 2000
- 100
Kleidocerys ericae
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 275
Kleopowiella placodioides
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 1,598
Klinggraeff's bryum moss
- Group
- Mosses
- Peak month
- October
- Records since 2000
- 1,833
Kluyveromyces nonfermentans
- Group
- Fungi
- Peak month
- August
- Records since 2000
- 540
Knapweed Broomrape
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 330
Knapweed plant bug
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 912
Kneiff's Feather-moss
- Group
- Mosses
- Peak month
- August
- Records since 2000
- 6,465
Kneiff's Hook-moss
- Group
- Mosses
- Peak month
- September
- Records since 2000
- 2,062
Kneiffia subalutacea
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 87
Knobbed brain coral
- Group
- Jellyfish, corals and anemones
- Peak month
- August
- Records since 2000
- 1,080
Knopper Gall
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 2,645
Knot Grass [moth]
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 4,052
Knotgrass
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 7,179
Knothole moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 134
Knotted Clover
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 348
Knotted Crane's-bill
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 621
Knotted Hedge-parsley
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 559
Knotted Pearlwort
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 357
Knotted Thread Hydroid
- Group
- Jellyfish, corals and anemones
- Peak month
- September
- Records since 2000
- 3,848
Knotted Wrack
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 4,248
Knotting Gall
- Group
- True flies
- Peak month
- June
- Records since 2000
- 1,483
Knotweed leaf beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 536
Knufia petricola
- Group
- Fungi
- Peak month
- August
- Records since 2000
- 551
Koenigia campanulata
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 161
Koenigia polystachya
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 187
Kohuhu
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 2,461
Koromiko
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 155
Kosswigianella exigua
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 64
Kroyera carinata
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 510
Kuettlingeria albolutescens
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 89
Kuettlingeria teicholyta
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 1,734
Kugelann’s Green Clock
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 169
Kuhnia scombri
- Group
- Flatworms
- Peak month
- August
- Records since 2000
- 76
Kurokawia runcinata
- Group
- Lichens
- Peak month
- July
- Records since 2000
- 866
Kurtia argillacea
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 200
Kurzia sylvatica
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 125
Kybos smaragdula
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 82