Part 2 of 3. Joel Sartore travels to Spain to photograph the Iberian lynx and to China to film the Yangtze giant softshell turtle. He also visits Cameroon, where he hopes to glimpse the rare Cross River gorilla.
Part 1 of 3. National Geographic photographer Joel Sartore attempts to document all the Earth's species. He begins in Madagascar and the Florida Keys; and, in Florida, he checks in on the key deer, a species that he first saw 20 years ago.