Relations of Daily Activity Patterns to Age and Flock of Wintering Black-necked Crane (Grus nigricollis) at Napa Lake, Shangri-La in Yunnan

WANG Kai, YANG Xiao-jun, ZHAO Jian-lin, YU Hong-zhong and MIN Long

Zoological Research 30 ( 1 ): 74 - 82 , 2009