Blue mud dauber
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[Photo] Spider hunter - Chalybion californicum at Hennepin County, Minnesota, USA. Date: July 13, 2007. Copyright ?? 2007 Tleilaxu (http://bugguide.net/user/view/9614). Image URL: http://bugguide.net/node/view/126870/bgpage

The blue mud dauber is a metallic blue species of mud dauber wasp that preys primarily on black widow spiders. It does not build a nest, but uses nests abandoned by other mud dauber wasps. Like other mud daubers, it is rarely aggressive.

http://en.wikipedia.org/wiki/Blue_mud_dauber

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