Cliff Swallow Not all birds trick members of another species into raising their young. Some—called conspecific, or intraspecific, brood parasites—pass their young off onto other members of their own species. Cliff swallows, for example, often deposit their own eggs in the nest of another bird within the colony in an attempt to get out of the responsibility of parenthood. When they trick another bird into raising their young, birds have more time and energy to devote to mating and laying eggs. Caption: Cliff swallows build their nests on rock faces and buildings.