Eudynamys melanorhynchus - The Black-billed Koel is a species of cuckoo in the Cuculidae family. It is endemic to forest and woodland on the Indonesian islands of Sulawesi, Sula, Banggai, Togian and other smaller nearby islands. It has often been considered conspecific with E. scolopaceus, but they are increasingly treated as separate species. Unlike the Black-billed Koel, all other members of the common koel complex have a pale bill.
Eudynamys orientalis - The Pacific Koel is found in forest, woodland, plantations and gardens from Wallacea east to the Solomon Island and south to northern and eastern Australia. The Pacific Koel has not been rated by IUCN, but the Australian Koel is considered to be of Least Concern.
Asian Koel - The Asian Koel is a member of the cuckoo order of birds, the Cuculiformes. It is found in South Asia, China, and Southeast Asia. It forms a superspecies with the closely related Black-billed and Pacific Koels which are sometimes treated as subspecies. The Asian Koel is a brood parasite that lays its eggs in the nests of crows and other hosts, where the young are raised by the foster parents. They are unusual among the cuckoos in being largely frugivorous as adults.
Long-tailed Cuckoo - The Long-tailed Cuckoo is a brood parasite, laying its eggs in the nests of Yellowheads, Whiteheads and Brown Creepers. The eggs hatch before those of the host do so and the young chicks eject the eggs of the host. Long-tail Cuckoo chicks are able to mimic the calls of their host's chicks.