Alder
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 16,859
- Home
- Species by county
- Gwynedd
Species recorded in Gwynedd
1,346 species
Gwynedd — county
Atlantic Salmon
- Group
- Fish
- Peak month
- August
- Records since 2000
- 16,731
False Oat-grass
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 16,693
Red-billed Chough
- Group
- Birds
- Peak month
- June
- Records since 2000
- 16,591
Ramsons
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 16,569
Ten-spot Ladybird
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 16,478
Dark Arches
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 16,454
Twite
- Group
- Birds
- Peak month
- October
- Records since 2000
- 16,436
Common Orange Lichen
- Group
- Lichens
- Peak month
- April
- Records since 2000
- 16,366
Light Brown Apple Moth
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 16,070
Marsh Thistle
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 16,059
Slow worm
- Group
- Reptiles
- Peak month
- May
- Records since 2000
- 15,975
Lady's Bedstraw
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 15,904
Swartz's Feather-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 15,831
Common Bent
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 15,749
16-spot Ladybird [Halyzia sedecimguttata]
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 15,745
Hart's-tongue
- Group
- Ferns and horsetails
- Peak month
- May
- Records since 2000
- 15,670
Black Redstart
- Group
- Birds
- Peak month
- October
- Records since 2000
- 15,620
Grey-spotted Sedgesitter
- Group
- True flies
- Peak month
- April
- Records since 2000
- 15,504
Hover Fly
- Group
- True flies
- Peak month
- August
- Records since 2000
- 15,338
Heath Spotted-orchid
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 15,205
Gorse
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 15,116
Marsh Fritillary
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 14,938
Hornwrack
- Group
- Bryozoans
- Peak month
- August
- Records since 2000
- 14,805
Cat's-ear
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 14,718
Fox-tail Feather-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 14,679
Hen Harrier
- Group
- Birds
- Peak month
- January
- Records since 2000
- 14,659
Common Smoothcap
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 14,629
Lesser Bird's-claw Beard-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 14,503
Tutsan
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 14,496
Yellow Archangel
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 14,460
Hawthorn Shieldbug
- Group
- True bugs
- Peak month
- September
- Records since 2000
- 14,450
Bruch's Pincushion
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 14,229
Golden Dung Fly
- Group
- True flies
- Peak month
- June
- Records since 2000
- 14,206
Cinnabar
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 14,180
Ladder-backed Hover Fly
- Group
- True flies
- Peak month
- April
- Records since 2000
- 14,120
Bittersweet
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 14,056
Ring Ouzel
- Group
- Birds
- Peak month
- April
- Records since 2000
- 13,904
Red-stemmed Feather-moss
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 13,899
European green crab, Shore Crab
- Group
- Crustaceans
- Peak month
- June
- Records since 2000
- 13,886
Glittering Wood-moss
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 13,837
Yellow Iris
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 13,607
Silver Sedge
- Group
- Caddisflies
- Peak month
- September
- Records since 2000
- 13,603
Honeysuckle
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 13,575
Dahlia Anemone
- Group
- Jellyfish, corals and anemones
- Peak month
- July
- Records since 2000
- 13,574
Silver Y
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 13,462
Polycentropus flavomaculatus
- Group
- Caddisflies
- Peak month
- May
- Records since 2000
- 13,349
Hydropsyche pellucidula
- Group
- Caddisflies
- Peak month
- September
- Records since 2000
- 13,302