Oniscus asellus ~ http://www.flickr.com/photos/qwertyqwertyqwerty/
Oniscus asellus is a species of woodlouse.
This species is common in Britain, and often found under rocks or rotten wood in gardens. Similar to the smaller Philoscia muscorum and the greyer Porcellio scaber.
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Distribution of Oniscus asellus in the UK