Some Additional Eastern Records of Swainson's Hawk (Buteo swainsoni)
نویسندگان
چکیده
منابع مشابه
Risk of feather damage explains fault bar occurrence in a migrant hawk, the Swainson's hawk Buteo swainsoni
Fault bars are common stress-induced feather abnormalities that could produce feather damage thus reducing flight performance. For that reason, it has been hypothesized that birds may have evolved adaptive strategies that reduce the costs of fault bars (the ‘fault bar allocation hypothesis’). An untested prediction of this hypothesis is that fault bars in important feathers for flight (wing and...
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Visceral gout is reported for the first time in a rough legged hawk (Buteo lagopus). Urate crystals were present on the pericardium, thoracic and abdominal air sacs, and the ventral surface of the liver. The liver and spleen also had urate crystals throughout the parenchyma. There was no indication of articular or renal involvement. The immediate cause of death in this hawk was not identified, ...
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ژورنال
عنوان ژورنال: The Auk
سال: 1893
ISSN: 0004-8038,1938-4254
DOI: 10.2307/4067916