Bodotria pulchella
- Group
- Crustaceans
- Records since 2000
- 1,047
- Peak month
- April
Melinopterus sphacelatus
- Group
- Beetles
- Records since 2000
- 1,037
- Peak month
- April
Lunar Marbled Brown
- Group
- Butterflies and moths
- Records since 2000
- 1,028
- Scientific name
- Drymonia ruficornis
Gomphonema olivaceum
- Group
- Seaweeds and algae
- Records since 2000
- 1,026
- Peak month
- April
King/Common Eider
- Group
- Birds
- Records since 2000
- 1,026
- Scientific name
- Somateria spectabilis
Lesser Spotted Woodpecker
- Group
- Birds
- Records since 2000
- 1,025
- Scientific name
- Dryobates minor
Cylindrotheca closterium
- Group
- Seaweeds and algae
- Records since 2000
- 1,005
- Peak month
- April
Skeletonema costatum
- Group
- Seaweeds and algae
- Records since 2000
- 993
- Peak month
- April
Psectrotanypus varius
- Group
- True flies
- Records since 2000
- 984
- Peak month
- April
Common Earthworm
- Group
- Worms (annelids)
- Records since 2000
- 982
- Scientific name
- Lumbricus terrestris
Tall Thyme-moss
- Group
- Mosses
- Records since 2000
- 976
- Scientific name
- Plagiomnium elatum
Wallflower
- Group
- Flowering plants
- Records since 2000
- 963
- Scientific name
- Erysimum cheiri
Handsome Woollywort
- Group
- Liverworts
- Records since 2000
- 959
- Scientific name
- Trichocolea tomentella
Black Gnat
- Group
- True flies
- Records since 2000
- 948
- Scientific name
- Bibio johannis
Salmonberry
- Group
- Flowering plants
- Records since 2000
- 948
- Scientific name
- Rubus spectabilis
Awl-leaved Screw-moss
- Group
- Mosses
- Records since 2000
- 946
- Scientific name
- Tortula subulata
Polypedilum uncinatum
- Group
- True flies
- Records since 2000
- 946
- Peak month
- April
Chinese Water Deer
- Group
- Mammals
- Records since 2000
- 941
- Scientific name
- Hydropotes inermis
Streamer
- Group
- Butterflies and moths
- Records since 2000
- 941
- Scientific name
- Anticlea derivata
Brunton's Dog-tooth
- Group
- Mosses
- Records since 2000
- 937
- Scientific name
- Cynodontium bruntonii
Common Bladder-moss
- Group
- Mosses
- Records since 2000
- 934
- Scientific name
- Physcomitrium pyriforme
Little Venus
- Group
- Molluscs
- Records since 2000
- 932
- Scientific name
- Gouldia minima
Heterocladium flaccidum
- Group
- Mosses
- Records since 2000
- 922
- Peak month
- April
Gammarus tigrinus
- Group
- Crustaceans
- Records since 2000
- 918
- Peak month
- April
Rustyback
- Group
- Ferns and horsetails
- Records since 2000
- 915
- Scientific name
- Asplenium ceterach
Microtendipes pedellus
- Group
- True flies
- Records since 2000
- 912
- Peak month
- April
Musk Stork's-bill
- Group
- Flowering plants
- Records since 2000
- 909
- Scientific name
- Erodium moschatum
False Puffball
- Group
- Microorganisms and protists
- Records since 2000
- 905
- Scientific name
- Reticularia lycoperdon
Liopterus haemorrhoidalis
- Group
- Beetles
- Records since 2000
- 884
- Also known as
- a water beetle
Entyloma ficariae
- Group
- Fungi
- Records since 2000
- 869
- Peak month
- April
Early Tooth-striped
- Group
- Butterflies and moths
- Records since 2000
- 868
- Scientific name
- Trichopteryx carpinata
Alexanders Rust
- Group
- Fungi
- Records since 2000
- 866
- Scientific name
- Puccinia smyrnii
Crater Lichen
- Group
- Lichens
- Records since 2000
- 860
- Scientific name
- Diploschistes scruposus
Powder-tipped Rosette Lichen
- Group
- Lichens
- Records since 2000
- 851
- Scientific name
- Physcia dubia
Spotted diving beetle
- Group
- Beetles
- Records since 2000
- 846
- Scientific name
- Agabus guttatus
Darparnaud's Glass Snail
- Group
- Molluscs
- Records since 2000
- 843
- Scientific name
- Oxychilus draparnaudi
Painted Nomad Bee
- Group
- Bees, wasps and ants
- Records since 2000
- 835
- Scientific name
- Nomada fucata
Hannaea arcus
- Group
- Seaweeds and algae
- Records since 2000
- 830
- Peak month
- April
Yellow-billed Loon
- Group
- Birds
- Records since 2000
- 826
- Scientific name
- Gavia adamsii
Common Grey Disco
- Group
- Fungi
- Records since 2000
- 822
- Scientific name
- Mollisia cinerea
Longitarsus dorsalis
- Group
- Beetles
- Records since 2000
- 816
- Peak month
- April
Lathbury's Nomad Bee
- Group
- Bees, wasps and ants
- Records since 2000
- 808
- Scientific name
- Nomada lathburiana
Common Oak Purple
- Group
- Butterflies and moths
- Records since 2000
- 800
- Scientific name
- Dyseriocrania subpurpurella
Pill Millipede
- Group
- Millipedes
- Records since 2000
- 787
- Scientific name
- Glomeris marginata
Rhyacophila munda
- Group
- Caddisflies
- Records since 2000
- 787
- Peak month
- April
Early Forget-me-not
- Group
- Flowering plants
- Records since 2000
- 778
- Scientific name
- Myosotis ramosissima
Spined Loach
- Group
- Fish
- Records since 2000
- 778
- Scientific name
- Cobitis taenia
Anticlea badiata
- Group
- Butterflies and moths
- Records since 2000
- 775
- Peak month
- April