Tipula oleracea
- Group
- True flies
- Records since 2000
- 4,355
- Peak month
- May
Two-toothed Door Snail
- Group
- Molluscs
- Records since 2000
- 4,241
- Scientific name
- Clausilia bidentata
Common Pondskater, Common pond strider
- Group
- True bugs
- Records since 2000
- 4,225
- Scientific name
- Gerris lacustris
Twin Fan Worm
- Group
- Worms (annelids)
- Records since 2000
- 4,203
- Scientific name
- Bispira volutacornis
Grass bug
- Group
- True bugs
- Records since 2000
- 4,190
- Scientific name
- Stenodema laevigata
Spotted gazelle beetle
- Group
- Beetles
- Records since 2000
- 4,163
- Scientific name
- Notiophilus biguttatus
Balm
- Group
- Flowering plants
- Records since 2000
- 4,147
- Scientific name
- Melissa officinalis
Hairy Snail
- Group
- Molluscs
- Records since 2000
- 4,146
- Scientific name
- Trochulus hispidus
Slender Ground Hopper
- Group
- Grasshoppers and crickets
- Records since 2000
- 4,115
- Scientific name
- Tetrix subulata
Slippery Moss Snail
- Group
- Molluscs
- Records since 2000
- 4,110
- Scientific name
- Cochlicopa lubrica
Brown Silver-line
- Group
- Butterflies and moths
- Records since 2000
- 4,097
- Scientific name
- Petrophora chlorosata
Asterisk Lichen
- Group
- Lichens
- Records since 2000
- 4,083
- Scientific name
- Arthonia radiata
Hypericum rhopalid
- Group
- True bugs
- Records since 2000
- 4,081
- Scientific name
- Rhopalus subrufus
Eudorella truncatula
- Group
- Crustaceans
- Records since 2000
- 4,065
- Peak month
- May
Blotch-winged Hoverfly
- Group
- True flies
- Records since 2000
- 4,060
- Scientific name
- Leucozona lucorum
Euclymene oerstedii
- Group
- Worms (annelids)
- Records since 2000
- 4,025
- Peak month
- May
Tanaopsis graciloides
- Group
- Crustaceans
- Records since 2000
- 4,001
- Peak month
- May
Pale Tussock
- Group
- Butterflies and moths
- Records since 2000
- 3,962
- Scientific name
- Calliteara pudibunda
Marine worm
- Group
- Worms (annelids)
- Records since 2000
- 3,912
- Scientific name
- Pseudopolydora paucibranchiata
Wood-sedge
- Group
- Flowering plants
- Records since 2000
- 3,912
- Scientific name
- Carex sylvatica
Winter Moth
- Group
- Butterflies and moths
- Records since 2000
- 3,872
- Scientific name
- Operophtera brumata
Brassica Bug
- Group
- True bugs
- Records since 2000
- 3,848
- Scientific name
- Eurydema oleracea
Levinsenia gracilis
- Group
- Worms (annelids)
- Records since 2000
- 3,848
- Peak month
- May
Common Stork's-bill
- Group
- Flowering plants
- Records since 2000
- 3,834
- Scientific name
- Erodium cicutarium
Hydroides norvegica
- Group
- Worms (annelids)
- Records since 2000
- 3,720
- Peak month
- May
White-shouldered House Moth
- Group
- Butterflies and moths
- Records since 2000
- 3,707
- Scientific name
- Endrosis sarcitrella
Hedgerow Crane's-bill
- Group
- Flowering plants
- Records since 2000
- 3,690
- Scientific name
- Geranium pyrenaicum
Beaked Corydalis
- Group
- Flowering plants
- Records since 2000
- 3,624
- Scientific name
- Pseudofumaria lutea
Water Avens
- Group
- Flowering plants
- Records since 2000
- 3,609
- Scientific name
- Geum rivale
White Stork
- Group
- Birds
- Records since 2000
- 3,594
- Scientific name
- Ciconia ciconia
Duke of Burgundy Fritillary
- Group
- Butterflies and moths
- Records since 2000
- 3,575
- Scientific name
- Hamearis lucina
Common Powderhorn
- Group
- Lichens
- Records since 2000
- 3,571
- Scientific name
- Cladonia coniocraea
Cellar Snail
- Group
- Molluscs
- Records since 2000
- 3,561
- Scientific name
- Oxychilus cellarius
Sessile Oak
- Group
- Flowering plants
- Records since 2000
- 3,548
- Scientific name
- Quercus petraea
Water measurer
- Group
- True bugs
- Records since 2000
- 3,544
- Scientific name
- Hydrometra stagnorum
Grey Sailor Beetle
- Group
- Beetles
- Records since 2000
- 3,495
- Scientific name
- Cantharis nigricans
Sea campion
- Group
- Flowering plants
- Records since 2000
- 3,472
- Scientific name
- Silene uniflora
Varied Rag Lichen
- Group
- Lichens
- Records since 2000
- 3,464
- Scientific name
- Platismatia glauca
Common Chrysalis Snail
- Group
- Molluscs
- Records since 2000
- 3,445
- Scientific name
- Lauria cylindracea
Demetrias atricapillus
- Group
- Beetles
- Records since 2000
- 3,443
- Peak month
- May
Pink Purslane
- Group
- Flowering plants
- Records since 2000
- 3,424
- Scientific name
- Claytonia sibirica
Black-striped cranefly
- Group
- True flies
- Records since 2000
- 3,421
- Scientific name
- Tipula vernalis
Mealy Pixie-cup
- Group
- Lichens
- Records since 2000
- 3,399
- Scientific name
- Cladonia chlorophaea
Freshwater Nerite
- Group
- Molluscs
- Records since 2000
- 3,393
- Scientific name
- Theodoxus fluviatilis
Common sycamore aphid
- Group
- True bugs
- Records since 2000
- 3,385
- Scientific name
- Drepanosiphum platanoidis
Welsh Poppy
- Group
- Flowering plants
- Records since 2000
- 3,384
- Scientific name
- Papaver cambricum
Golden trumpet worm
- Group
- Worms (annelids)
- Records since 2000
- 3,367
- Scientific name
- Amphictene auricoma
Murky-legged Black Legionnaire
- Group
- True flies
- Records since 2000
- 3,359
- Scientific name
- Beris chalybata