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False widow spider: small, deadly – and in the UK A cousin of the black widow, Steatoda nobilis has infiltrated these shores and is spreading everywhere. But no one has died yet

U.S. Black Widow Spider, poisonous and dangerous. (also upside-down)

Western Black WidowCredit: © AMNH\R. MickensA western black widow, Latrodectus Hesperus. One of the few species harmful to people in North America, a black widow often features a red hourglass shape on its underside.