Members of the Cuckoo Wasp family - Chrysidinae, are generally parasites or cleptoparasites, laying their eggs in host nests, where their larvae consume the host egg or larva while it is still young, then consuming the provisions. They have generally brilliantly colored metallic-like and highly sculptured bodies. They are most diverse in desert regions of the world, as they are typically associated with solitary bee and wasp species, which are also most diverse in such areas.

The species on the image, Hedychrum rutilans, is known to parasite on European Beewolves.