ReproductionThe nest is a simple burrow with several brood cells branching off it. The entrances to the burrows are identifiable by the conical mounds of excavated spoil on the surface. The female fills the brood cells with a mixture of nectar and pollen, and lays one egg in each cell. The larva hatches within a few days, grows quickly and pupates within a few weeks. The adults emerge the following spring after hibernation. The male emerges before the female. The nests are frequently invaded by cleptoparasitic "cuckoo bees."
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