In this image from video provided by the Smithsonian National Zoo, Mei Xiang gives birth to a cub two hours after her water broke Friday. A second cub born Saturday was stillborn. AP hide caption

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The giant panda Lin Ping, a star in Thailand whose mandatory trip to China was due at the end of May, can spend up to 15 years in Thailand, under a deal announced this week. The 43-day-old Lin Ping was held by her mother, Lin Hui, in this 2009 photo. Wichai Taprieu/AP hide caption

itoggle caption Wichai Taprieu/AP

Panda cub Xiao Liwu was eager to play with a plastic ball during an exam last month. He made his public debut at the San Diego Zoo on Thursday. Ken Bohn/San Diego Zoo/AP hide caption

itoggle caption Ken Bohn/San Diego Zoo/AP

Dennis Kelly (right), director of the Smithsonian's National Zoo, and Suzan Murray, chief veterinarian, discuss the panda cub's death. Mark Wilson/Getty Images hide caption

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A composite of images from the panda cam, showing Mei Xiang during and after giving birth. National Zoo/Xinhua/Landov hide caption

itoggle caption National Zoo/Xinhua/Landov