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pinnated bittern
The pinnated bittern (''Botaurus pinnatus''), also known as the South American bittern, is a large member of the heron family (Ardeidae) found in the New World tropics. Like the other ''Botaurus'' bitterns, its plumage is mostly buffy-brown and cryptically patterned. Though it is a widespread species, it is rarely seen – presumably due to its skulking habits – and much about its life history remains little known.
==Description==
The pinnated bittern is a large heron, measuring between 〔 with a weight that ranges from ; males typically weigh considerably more than females.〔 Sexes are similarly plumaged, but females tend to be smaller than males and have brown instead of black on the tail.〔Martínez-Vilalta & Motis (1992)〕
Both adults and immature birds are generally buffy, though heavily marked with cryptic patterning. Juveniles tend to have a somewhat more reddish ground color. The throat is unmarked white, the foreneck is white broadly streaked with pale brown, and the rest of the neck is buff with thin black barring. The breast and belly are white with broad pale brown streaks, while the back is buff, heavily streaked and barred with black. Rectrices are black in males and brown in females; the slate-grey remiges create a conspicuous two-toned effect in flight.
The bill is stout and strong, yellowish overall with a dusky upper mandible. The bare facial skin is bright yellow, with a brown line running across the lores. The legs are greenish-yellow, and the iris is yellow.
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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