The definition of koyal bird is at Dictionary.com
The Asian koel is a member of the Cuculiformes.The Indian Subcontinent, China, and Southeast Asia are where it is found.It is a superspecies with the black-billed and Pacific koels.The Asian koel is a brood parasites that lays its eggs in the nest of crows and other hosts who raise its young.They are mostly frugivorous as adults.The name koel has several language variations.Indian and Nepali poets use the bird as a symbol.There is additional citation needed.
The Asian koel is large and long-tailed and has a weight of 190– 327 g.The male of the nominate race is glossy bluish-black, with a pale greenish grey bill, and it has grey legs and feet.The female of the nominate race has brown hair and rufous streaks on her head.The back, rump and wing coverts are dark brown.The under parts are striped.The other subspecies have different sizes and colors.The young birds have a black beak, which is similar to the male's.During the breeding season in the Indian Subcontinent, they are very vocal with a range of different calls.The male sings a song called koo-Ooo.The female makes a loud noise.There are different calls across populations.[9]
They show a different pattern of moult.The inner primaries are moulted in stepwise descending order.Payne is citing Stresemann.
The Asian koel was originally described as Cuculus scolopaceus by Carl Linnaeus.There are several island populations of the species and a number of variations have been suggested.The black-billed koel of the Sulawesi region is sometimes considered conspecific with the Asian koels in which case the "combined" species is known as the common Koel.The three are now treated as separate species due to their differences.Only the black-billed koel has been considered as a separate species, or the Asian koels have included all of the other subspecies, except for the one in Australia.There is a plant called cyanocephalus.It was 13 and 14.
There are several forms of the Asian koel that have plumage differences or are geographically isolated.Payne gave a list of named subspecies with their distributions and synonyms.
The Asian koel is a light bird.It is a resident of tropical southern Asia from Iran and India to southern China and the Greater Sundas.They were among the first birds to colonize the volcanic island of Krakatau.They became very common in Singapore after arriving in the 1980s.[9]
The Asian koel lays its single egg in the nest of a variety of birds, including the jungle crow and house crow.The jungle crow was the only one that was known to be able to parasitize the house crow.A study in India found 5% of Corvus splendens.[20]
The long-tailed shrike, common myna, and house crows are all parasites in Bangladesh.Host nest at low heights and close to fruit trees were preferred by koels.In southern Thailand and the Malay Peninsula, koels have shifted host from crows to mynas.The latter became more common in the late 1900s.The black-headed oriole and the European magpie have been found to be parasites.Males may distract the hosts so that the female can lay an egg.The female visits the nest on her own.A study in Pakistan found that the first koel eggs were laid within a day or two of the host's first egg.The koel's chick hatched 3 days ahead of the host chick.Koels usually only lay an egg or two in a single nest, but as many as seven to eleven eggs have been reported from some host nest.A female can remove a host egg before laying.Eggs can hatch in 12 to 14 days.The young koel calls like a bird when it pushes out eggs or evicts the host chick.In 20 to 28 days, the young fledge.Unlike some other cuckoos, the young do not attempt to kill the host chick, a trait that is shared with the channel-billed cuckoo.It has been suggested by someone.koels do not evict the host chick due to the higher cost of evicting nestmates.A small parasites may not be able to evict large host eggs from a deep Corvid nest without risking starvation and possibly accidental self-eviction.Retaining host chick did not gain much support.Adult female parents are known to feed young koels in the nest of the hosts.Adult males have not been feeding the birds.[9][38][39]