Bombylius major, the large bee fly, is a fly which is a beemimic. It is a parasitoid on bees and wasps. The eggs are flicked by the adult female toward the entrance of the underground nests of solitary bees and wasps. After hatching, the larvae find their way into the nests to feed on the grubs.
↑Stubbs, A. and Drake, M. (2001). British Soldierflies and their allies: a field guide to the larger British Brachycera. British Entomological & Natural History Society. pp. 512 pp. ISBN1899935045.CS1 maint: Multiple names: authors list (link)