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Cuckoo bumblebee

Cuckoo bumblebee females emerge from hibernation later than their host species to ensure that their host has had sufficient time to establish a nest. Before finding and invading a host colony, a Psithyrus female feeds directly from flowers until her ovaries are sufficiently developed, at which time she begins seeking a nest to invade. Once she has located and infiltrated a host colony, the Psithyrus female usurps the nest by killing or subduing the host queen. She then lays her own eggs, exploiting the host workers to feed her and her developing young through pheromones and/or physical attacks.