Osmia avosetta is a species of mason bee. It is solitary by nature, and is notable for its distinctive use of flower petals to construct nests for its larvae.

Nesting

The female O. avosetta digs shallow tunnels in the ground consisting of one or two chambers, each of which it then covers with flower petals glued together with mud. It then places larval food in each chamber and seals it with soil and by folding

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