1. Pertaining or related to the cuckoo; applied to a group of birds related to the cuckoos; also to the cuckoo-bees.
2. The Cuculidae family has about 130 species of birds (Cuculiformes) consisting of cuckoos and roadrunners.

Cuckoos are found in woodland habitats worldwide, are commonly migratory, and many Old World species are nest parasites (dumping a smaller bird’s eggs out of the nest and replacing them by laying cuckoo eggs and leaving them to be cared for by the host bird).

Roadrunners are terrestrial in open arid regions and feed on invertebrates, small vertebrates, and fruit.