Northern brown argus  (Aricia artaxerxes)

Description

This small butterfly is dark brown in colour with orange crescents towards the edge of the wings, those on the forewings are absent or very small, and the underside is pale (1). In Britain there is a noticeable white spot in the centre of the upperside of both forewings (1). The caterpillar measures up to 1.3 centimetres in length, and has a green body with a darker green line along the sides (3).

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