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cuckoo bee, any of more than 3,000 species of solitary bees that engage in brood parasitism, a form of kleptoparasitism in which the bees deposit their eggs in the food-provisioned nests of other bees. Cuckoo bees are found on every continent except Antarctica and occupy a range of habitats. The term cuckoo bee is a behavioral descriptor and not a taxonomic group. As such, bees that exhibit this behavior are found in a number of...