Abstract:They are typically solitary, so each female builds her own nest, consisting of one or a few cells at the end of a gallery, each cell presenting a clear bilateral symmetry. Some species can present a gregarious behavior, so they can be found forming aggregations of up to 40 females. Exceptionally, groups of up to 500 females have been found sharing a single entrance to the nest, a behavior that gives them an advantage over some parasites The family Andrenidae (Bulldozer bees) are not offensive, only when defend… Show more
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