Giant panda bear cub Bao Bao moves around inside the David M. Rubenstein Family Giant Panda Habitat at the Smithsonian National Zoological Park in Washington (Photo by Chip Somodevilla/Getty Images via LightBox)
Photograph by Chengdu Research Base of Giant Panda Breeding/Reuters
March 10, 2013. A female giant panda, Ke Lin, watches a panda mating video at Chengdu Research Base of Giant Panda Breeding, Sichuan province. According to the staff of the research base, they showed Ke Lin this video trying to teach her know how to mate as she kept rejecting her. After watching this video, Ke Lin and Yong Yong successfully mated.