Small Tortoiseshell
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Aglais urticae
Very common & widespread in Britain.
The Larvae feeds on Common Stinging Nettle.
It is a medium-sized Butterfly that is mainly reddish orange, with black and yellow markings on the forewings as well as a ring of blue spots around the edge of the wings.
Underside of the forewing ochreous, with the costal spots as above, the apex and distal margin blackish; hindwing brown, basal half black with dentate edge, the whole surface with darker pencilling; at the distal margin of both wings contiguous dull blue lunules.
The sexes are similar.
Flight period is from March-October.