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Black-billed cuckoo
The black-billed cuckoo (''Coccyzus erythropthalmus'') is a New World species in the Cuculidae (cuckoo) family. It is very similar and overlaps in range with the closely related yellow-billed cuckoo. A distinguishing characteristic of family Cuculidae is laying eggs in the nests of other birds. Although many cuckoos are obligate brood parasites, ''C. erythropthalmus'' often incubate their own chicks.〔Sealy SG. (2003). Laying times and a case of conspecific nest parasitism in the Black-billed Cuckoo. ''Journal of Field Ornithology.'' 74(3): 257-260.〕
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==Description==
Adults have a long, graduated brown tail and a black, slightly downcurved bill. The head and upper parts are brown and the underparts are white. The feet are zygodactylous. Juveniles are drabber and may contain some rufous coloration on the wing. The adults have a narrow, red orbital ring while the juveniles' is yellow.〔Peterson RT. (2008). ''Peterson Field Guide to Birds of North America.'' 1st ed. New York, NY: Houghton Mifflin Company. 531 p.〕 Black-billed cuckoo chicks have white, sparsely-distributed, sheath-like down that contrasts heavily with their black skin. They also have complex, creamy-colored structures on their mouth and tongue, which may appear like warts or some type of parasitic infection however they are normal for the species.〔Nolan V. (2002). External Differences between Newly Hatched Cuckoos (Coccyzus americanus and C. erythropthalmus). ''The Condor.'' 77(3):341.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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