Black Cuckoos are a species of bird found in the Old World, belonging to the family Cuculidae. The term can refer to three different species: Anis, LOONIES, and KEN. Anis is a small black cuckoo found in Africa, while LOONIES is a medium-sized black cuckoo found in Europe and Asia. KEN is a large black cuckoo found in India and Sri Lanka. All three species are known for their distinctive calls and are considered to be important indicators of the health of their respective ecosystems.