
Amaurobius is a genus of araneomorph spiders with mostly holarctic distribution. It is one of a few species of spiders that can eat a spider hunting wasp if the wasp becomes entangled in its silk. ...
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http://en.wikipedia.org/wiki/Amaurobius

Amaurobius is a genus of spider. A British species, Amaurobius similis is common and widespread behind walls, on bark and on fences where it builds a tangled web leading back to a crevice where the spider waits for its prey.
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http://www.probertencyclopaedia.com/browse/BA.HTM
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