Natterer's Bat
- Group
- Mammals
- Peak month
- February
- Records since 2000
- 13,257
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- Species by county
- Gwynedd
Species recorded in Gwynedd
1,346 species
Gwynedd — county
Mouse-tail Moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 13,215
Common Pincushion
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 13,176
Horned Grebe
- Group
- Birds
- Peak month
- January
- Records since 2000
- 13,082
Overleaf Pellia
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 13,066
Tufted Hairgrass
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 13,053
Cryphaea heteromalla
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 13,047
Creeping Bent
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 13,035
Crescent-cup Liverwort
- Group
- Liverworts
- Peak month
- March
- Records since 2000
- 13,008
Soldier fly
- Group
- True flies
- Peak month
- June
- Records since 2000
- 12,979
Common Striated Feather-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 12,901
Flame Shoulder
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 12,865
Toothed Wrack
- Group
- Seaweeds and algae
- Peak month
- July
- Records since 2000
- 12,824
Common Dog-violet
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 12,787
White Earwort
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 12,767
Fern-leaved Hook-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 12,557
Common long-eared bat
- Group
- Mammals
- Peak month
- June
- Records since 2000
- 12,493
Noctule Bat
- Group
- Mammals
- Peak month
- July
- Records since 2000
- 12,276
Long-beaked Water Feather-moss
- Group
- Mosses
- Peak month
- August
- Records since 2000
- 12,273
Wild Angelica
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 12,214
Bladder Wrack
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 12,111
Enchanter's nightshade, Witch's grass
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 12,056
Silverweed
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 12,032
Elegant Silk-moss
- Group
- Mosses
- Peak month
- April
- Records since 2000
- 11,892
Sitka Spruce
- Group
- Conifers
- Peak month
- March
- Records since 2000
- 11,870
Endive Pellia
- Group
- Liverworts
- Peak month
- September
- Records since 2000
- 11,837
River Feather-moss
- Group
- Mosses
- Peak month
- April
- Records since 2000
- 11,799
Atlantic spider crab
- Group
- Crustaceans
- Peak month
- September
- Records since 2000
- 11,797
Purple Moor-grass
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 11,789
Devil's-bit Scabious
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 11,742
Common Flower Fly
- Group
- True flies
- Peak month
- July
- Records since 2000
- 11,730
Christmas tree worm
- Group
- Worms (annelids)
- Peak month
- August
- Records since 2000
- 11,700
Thickpoint Grimmia
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 11,680
Lesser Pocket-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 11,582
Rhododendron
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 11,503
Boring sponge
- Group
- Sponges
- Peak month
- June
- Records since 2000
- 11,493
Volucella pellucens
- Group
- True flies
- Peak month
- June
- Records since 2000
- 11,473
Water Mint
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 11,367
Agapetus fuscipes
- Group
- Caddisflies
- Peak month
- April
- Records since 2000
- 11,335
Frizzled Pincushion
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 11,282
Little Shaggy-moss
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 11,231
Pyramidal Orchid
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 11,220
Square Caddisfly
- Group
- Caddisflies
- Peak month
- April
- Records since 2000
- 11,212
Heath Bedstraw
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 11,207
Supine Plait-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 11,134
Common Green Grasshopper
- Group
- Grasshoppers and crickets
- Peak month
- July
- Records since 2000
- 11,050
Narrowleaf Vetch
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 11,032
Dotted Thyme-moss
- Group
- Mosses
- Peak month
- April
- Records since 2000
- 11,029