Harbor porpoise
- Group
- Mammals
- Peak month
- July
- Records since 2000
- 6,518
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- Species by county
- Na h-Eileanan Siar
Species recorded in Na h-Eileanan Siar
773 species
Na h-Eileanan Siar — county
Angle Shades
- Group
- Butterflies and moths
- Peak month
- September
- Records since 2000
- 6,497
Yellow Shell
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 6,476
Green Mountain Fringe-moss
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 6,463
Common Rough Woodlouse
- Group
- Crustaceans
- Peak month
- April
- Records since 2000
- 6,413
Flounced Rustic
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 6,401
Dingy Dowd
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 6,293
Clouded Drab
- Group
- Butterflies and moths
- Peak month
- April
- Records since 2000
- 6,269
Tumid Notchwort
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 6,264
Snipefly
- Group
- True flies
- Peak month
- June
- Records since 2000
- 6,241
Salted Shield Lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 6,211
Notched pouchwort
- Group
- Liverworts
- Peak month
- April
- Records since 2000
- 6,149
Meadow Campion
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 6,145
Small Square-spot
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 6,140
Rock Pocket-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 6,047
Eurasian Smoothwing
- Group
- True flies
- Peak month
- July
- Records since 2000
- 5,929
Spectacle
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 5,896
Silver-ground Carpet
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 5,881
Red Beard-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 5,799
Plectrocnemia conspersa
- Group
- Caddisflies
- Peak month
- May
- Records since 2000
- 5,775
Burnished Brass
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 5,765
Parrot Waxcap
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 5,759
Sheep Tick
- Group
- Mites, harvestmen and other arachnids
- Peak month
- June
- Records since 2000
- 5,741
European Crane Fly
- Group
- True flies
- Peak month
- September
- Records since 2000
- 5,709
Furry Dronefly
- Group
- True flies
- Peak month
- August
- Records since 2000
- 5,653
Carrageen
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 5,647
Mother of Thyme
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 5,633
Buff-tip
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 5,604
Limnephilus marmoratus
- Group
- Caddisflies
- Peak month
- August
- Records since 2000
- 5,591
Ring-necked Duck
- Group
- Birds
- Peak month
- January
- Records since 2000
- 5,556
Mottled Beauty
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 5,432
Kidney Vetch
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 5,335
Greater Fork-moss
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 5,279
Tramp slug, Brown field slug, Longneck field slug, Chestnut Slug
- Group
- Molluscs
- Peak month
- April
- Records since 2000
- 5,242
Glaucous Gull
- Group
- Birds
- Peak month
- January
- Records since 2000
- 5,212
Flame Carpet
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 5,167
Common Pug
- Group
- Butterflies and moths
- Peak month
- May
- Records since 2000
- 5,108
Short-necked gazelle beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 5,096
Black Crowberry
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 5,057
Feathery Bog-moss
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 5,044
Blow Lug, Lugworm, Lobworm
- Group
- Worms (annelids)
- Peak month
- August
- Records since 2000
- 5,017
Mueller's Pouchwort
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 5,006
Diamond-backed Moth
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 4,928
Western Earwort
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 4,917
Buck's-horn Plantain
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 4,894
Drinker
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 4,790
Red Bog-moss
- Group
- Mosses
- Peak month
- August
- Records since 2000
- 4,772
Shining Hookeria
- Group
- Mosses
- Peak month
- April
- Records since 2000
- 4,753