Nomad Bee (Apidae: Nomadinae: genus Nomada) from Iowa. Members of this subfamily are called cuckoo bees thanks to their kleptoparasitic lifestyle - that is, they steal the hard-earned resources of other bees to feed their young. Once a female finds a rival nest, she waits for its occupant to leave before laying an egg on the hard-earned pollen deposits collected by its owner, who will raise her larvae as if they were her own.
Ensign Wasp (Evaniidae) from Cambodia. These unusual-looking parasitic wasps lay their eggs inside cockroach oothacae (egg cases), which hatch into hungry larvae that consume the roach's eggs.
Ichneumon wasp (Ichneumonidae: Cryptinae) from Wisconsin.
