Twin polar bears rest in the sun in Dalian Laohutan Ocean Park in Dalian, northeast China's Liaoning Province, April 25, 2011. The twins, a boy and a girl, were born on Jan. 7 this year. After 109 days' nurturance, the park declared Monday that the cubs survived, which became the first girl-and-boy twin polar bears surviving in China. [Xinhua/Li Yuze]