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Mariana crow
The Mariana crow (''Corvus kubaryi'') (Chamorro name: ''aga'') is a species of the crow family from the South Pacific. It is an endangered species which has steadily declined in numbers since the 1960s.〔USFWS (2007)〕
==Description==
The Mariana crow is a small black crow with a bluish-black gloss on its tail, and a greenish-black gloss on its back, underparts, head, and wings. In general, females are smaller than males. An adult weighs about 9 ounces (250 grams) and is about 15 inches (38 centimetres) long.
The Mariana crow has a variety of vocalizations, including two locational calls used to maintain contact between pairs, family members and flock mates. These locational calls are either a high-pitched series of 1–3 ''caw'' or ''hi'' sounds, or a series of longer ''caw'' sounds with a nasal ''aaa'' element to the call; the latter call may be used exclusively between mated pairs. Alarm calls are a rapid series of sharp ''caw''s. The birds also make a variety of squalling, guttural sounds, which may be done either quietly or excitedly. These sounds are typically accompanied by activities such as the ripping of leaves or the hammering of branches, and may serve as part of courtship or pair bonding.〔
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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