In 1998, a mere 124 giant pandas lived in captivity around the world, most of them in China. Breeders there were having an impossible time getting the animals to make babies. Part of the problem was that nobody knew the details about how the animals reproduce.
After some basic research, scientists discovered that female giant pandas become fertile just once a year for a tiny window of time, lasting between 24 and 72 hours. Males, meanwhile, are sexually active for about half year, from October through May. "We learned so much through all of this," Wildt said, "that we started turning around the breeding program."
Today, there are 293 captive giant pandas worldwide, 253 of them in China. In just a decade, the number of animals in captivity has more than doubled. For such an endangered species, a strong captive community is like an insurance policy for shrinking wild populations.
WATCH: Why is it so special when a giant panda cub is born? The problems associated with panda reproduction is explored in this Animal Planet video.