A flock of Mandarin ducks

A flock of Mandarin ducks (Aix galericulata) fly across a lake in Wuyuan county, east China's Jiangxi province. Wuyuan's environmental protection efforts in recent years have turned it into an ideal wild bird habitat. More than 370 wild bird species, including 36 endangered species, now live in the county's 193 conservation areas. (Photo: Zhang Weiguo / Corbis)