Mink
- Group
- Mammals
- Peak month
- September
- Records since 2000
- 4,610
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- Species by county
- Denbighshire
Species recorded in Denbighshire
264 species
Denbighshire — county
Achnanthes minutissima
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 4,527
Olive Upright
- Group
- Mayflies
- Peak month
- April
- Records since 2000
- 4,445
Hydraena gracilis
- Group
- Beetles
- Peak month
- September
- Records since 2000
- 4,245
Hydropsyche instabilis
- Group
- Caddisflies
- Peak month
- April
- Records since 2000
- 4,225
Minnow
- Group
- Fish
- Peak month
- August
- Records since 2000
- 4,107
Stone Loach
- Group
- Fish
- Peak month
- August
- Records since 2000
- 4,026
Floating Sweet-grass
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 4,022
Common Yellow Sally
- Group
- Stoneflies
- Peak month
- April
- Records since 2000
- 3,775
Common Small Yellow Sally
- Group
- Stoneflies
- Peak month
- April
- Records since 2000
- 3,436
Esolus parallelepipedus
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 3,331
Blue-winged Olive
- Group
- Mayflies
- Peak month
- September
- Records since 2000
- 3,275
Water hog lice/slaters
- Group
- Crustaceans
- Peak month
- September
- Records since 2000
- 3,172
Navicula gregaria
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 3,118
Marshpepper Knotweed
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 2,959
Potamophylax cingulatus
- Group
- Caddisflies
- Peak month
- April
- Records since 2000
- 2,887
Gomphonema parvulum
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,885
Reimeria sinuata
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,874
Yellow spotted sedge
- Group
- Caddisflies
- Peak month
- May
- Records since 2000
- 2,862
Brook-side Feather-moss
- Group
- Mosses
- Peak month
- August
- Records since 2000
- 2,861
Navicula lanceolata
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 2,789
Cocconeis placentula
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,767
Amphora pediculus
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,661
Smooth Needle Fly
- Group
- Stoneflies
- Peak month
- April
- Records since 2000
- 2,645
New Zealand Pigmyweed
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 2,618
Hairy Whirligig
- Group
- Beetles
- Peak month
- September
- Records since 2000
- 2,611
Nectoporus sanmarkii
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 2,581
Late Needle Fly
- Group
- Stoneflies
- Peak month
- September
- Records since 2000
- 2,409
Glossosoma boltoni
- Group
- Caddisflies
- Peak month
- September
- Records since 2000
- 2,394
Leeches
- Group
- Worms (annelids)
- Peak month
- April
- Records since 2000
- 2,391
Synedra dissipata
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,300
Nitzschia palea
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,250
Polycelis felina
- Group
- Flatworms
- Peak month
- April
- Records since 2000
- 2,250
Achnanthes oblongella
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,248
Planothidium lanceolatum
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,245
Exilaria vaucheriae
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 2,228
Cocconeis euglypta
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,218
Gomphonema intricatum
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,121
Planothidium frequentissimum
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,083
Common Early Brown
- Group
- Stoneflies
- Peak month
- October
- Records since 2000
- 2,046
Fragilaria capucina
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,037
Common Heath
- Group
- Butterflies and moths
- Peak month
- May
- Records since 2000
- 2,028
Navicula minima
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,013
Rhoicosphenia abbreviata
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,005
Caenis rivulorum
- Group
- Mayflies
- Peak month
- April
- Records since 2000
- 2,004
Encyonema minutum
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 2,002
Encyonema silesiacum
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 1,999
Orange-striped Stonefly
- Group
- Stoneflies
- Peak month
- September
- Records since 2000
- 1,953