The blue mud dauber (Chalybion californicum) 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. It is similar in shape and colour to the steel-blue cricket hunter (Chlorion aerarium). Also the male population does not have a stinger, therefore it cannot attack and its sole purpose is for reproduction.
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