Common Blue (Polyommatus icarus)

Male
Male
Male underside
Male underside
Female - blue form. Female Common Blue is our most variable butterfly and can be found in a wide colour range...
Female - blue form. Female Common Blue is our most variable butterfly and can be found in a wide colour range...
Female
Female
Female
Female
Female - brown form, which can be confused with Brown Argus</A>.
Female - brown form, which can be confused with Brown Argus.
 
Information

NERC Act S41: Not listed
Local status: Locally common. Colonies exist all over the county.
Size: Small.
Larval foodplant: Common Bird's-foot Trefoil, Black Medick, Lesser-yellow Trefoil and probably other related plants.
No. of broods: Two
Flight time(s): Mid-May to early July. Late July to mid September.
Winter: Larva
Habits: Generally flies below head height, unlike Holly Blue which generally flies higher. In flight the two species can be confused, but the undersides are distinctly different.
Habitats: Brown-field sites, downland, unimproved grassland, heathland, road verges, track edges, woodland rides.
Distribution:

Normalized Weekly Abundance


Flight time graph


No. of Adults

Number of adults
No. of 1km Squares

Number of 1km squares
No. of Records

Number of records
No. of Adults per record

Adults per record
Percentage of all adults

Percentage of all adults reported (of all species) in each year
Percentage of all records

Percentage of all butterfly records
No. of adults per 10,000 records

Number of adults in every 10,000 butterfly records (of all species)