Small tortoiseshell
Aglais urticae
Size: wingspan 45-55mm (male), 52-62mm (female).
Description: red with black and yellow markings and characteristic blue flecks on wing edges.
Habitat: prefers flowery places and waste ground where its larval food plant stinging nettle grows.
Distribution: throughout the UK.
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                                 Upperwings of the small tortoiseshell (Christine Martin/WTML)  - 
                             
                                 Underwings of the small tortoiseshell (northeastwildlife.co.uk)