Flocks of migrant birds are leaving Poyang Lake in East China's Jiangxi Province, heading north again as temperatures continue to rise with the return of spring. (Photos: Xinhua; compiled by Liu Hanyi)

Flocks of migrant birds are leaving Poyang Lake in East China's Jiangxi Province, heading north again as temperatures continue to rise with the return of spring. (Photos: Xinhua; compiled by Liu Hanyi)

Flocks of migrant birds are leaving Poyang Lake in East China's Jiangxi Province, heading north again as temperatures continue to rise with the return of spring. (Photos: Xinhua; compiled by Liu Hanyi)

Flocks of migrant birds are leaving Poyang Lake in East China's Jiangxi Province, heading north again as temperatures continue to rise with the return of spring. (Photos: Xinhua; compiled by Liu Hanyi)