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BiologyMason bees nest in cavities such as in dry-stone walls and holes in trees. In the UK, this species shows a preference for the former, but sites in rock faces and dead standing trees are also used. The nest cells are constructed with sand grains or mud, bound together with saliva or water collected from a nearby source.The female bees lay one egg in each cell, and provision the cell with pollen and nectar, collected from bird's-foot trefoil. The western mason bee is sometimes the victim of parasitism by the cuckoo wasp Chrysura hirsuta.