識別
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A distinctive swift of lowland forest with a square tail and bulging wings that are “pinched” at the body and widest in the center. Wings, back, and throat are blackish, while belly, tail, and rump are white. Could be confused with Cassin’s Spinetail, but Sabine’s Spinetail’s tail extends out beyond the wings, giving it a typical swift appearance. Call is a high-pitched twitter.
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