The first, largest and most-successful panda-breeding center in the world is China's Research and Conservation Centre at Wolong.
You You the panda endures a long and difficult labor at China's Wolong National Nature Reserve. She gives birth to twins, but one is stillborn.
A four-year-old panda named Mei Sheng leaves the San Diego Zoo for Wolong, and an official ceremony marks the separation of the six-month-old pandas from their mothers.
Panda behavior is observed during mating season at Wolong National Nature Reserve, and the threats to wild pandas in China's Qinling Mountains are highlighted.
As another year draws to a close, the staff at China's Wolong National Nature Reserve takes a look at how far the pandas have progressed.
