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1 March 2016 Group Size Effects on Vigilance of Wintering Black-Necked Cranes (Grus nigricollis) in Tibet, China
Le Yang, Cang jue Zhuom, Zhongqiu Li
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Abstract

Vigilance is a behavior in birds that is used to detect predators and monitor rivals, and it can be affected by several environmental and social factors, including group size. Here, Black-necked Cranes (Grus nigricollis) were observed in winter in the Yarlung Zangbo Nature Reserve, Tibet, China, to examine the effect of group size on vigilance behavior at both the individual and group levels. At the individual level, individual Black-necked Cranes in large social groups spent less time in vigilant behavior than when in small family groups. At the social group level, the proportion of vigilant individuals decreased, while the proportion of intervals that at least one individual was vigilant increased, with increasing group size. There was a significant group size effect on vigilance behavior in wintering Black-necked Cranes at both of these levels.

Le Yang, Cang jue Zhuom, and Zhongqiu Li "Group Size Effects on Vigilance of Wintering Black-Necked Cranes (Grus nigricollis) in Tibet, China," Waterbirds 39(1), 108-113, (1 March 2016). https://doi.org/10.1675/063.039.0114
Received: 30 July 2015; Accepted: 6 November 2015; Published: 1 March 2016
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KEYWORDS
Black-necked Crane
flock size
group size
Grus nigricollis
Qinghai-Tibet Plateau
vigilant behavior
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