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.
TIME Picks the Most Surprising Photos of 2013, a look back at a selection of underreported, improbable and astounding images that caught the attention of TIME’s photo editors.