Brown Argus

Aricia agestis

Aricia agestis, the brown argus, is a butterfly in the family Lycaenidae. It is found throughout the Palearctic realm, north to northern Jutland (Denmark), west as far as coastal Wales and east to Siberia and the Tian Shan. Source

Where it is now

In the last 8 weeks this insect was recorded 109 times across 6 areas (each area is a 5 degree square).

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Movement and weather

Over the weeks it was present in the past year, its centre in Europe ranged from 44°N in June to 52°N in May, about 900 km apart.

Arrival dates

The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.

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Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.