National Geographic's Sarah Lazarus reports on the search for the Hainan gibbon.
When dawn breaks on Futou Ling, a mountain on Hainan Island off China’s south coast, the last remaining gibbons begin to sing.
Males climb to the treetops, where their voices will carry the farthest, and start warbling, hooting, and shrieking. Females and youngsters join in, creating an intense musical cacophony that fills the tropical forest.
Samuel Turvey and Jessica Bryant are ready at their listening posts. When they hear the song of the gibbons, they run toward it.
“The Hainan gibbon,” says Turvey, a senior research fellow at the Zoological Society of London, “is the world’s rarest ape, the world’s rarest primate and, almost certainly, the world’s rarest mammal.” (Only three northern white rhinos remain, but that is a subspecies of white rhino.)
Some 28 gibbons survive in a six-square-mile (16-square-kilometer) patch of rainforest in Bawangling National Nature Reserve, in western Hainan. They are found nowhere else. With such a tiny population, there’s a high risk of a random catastrophic event—a typhoon, a forest fire, an outbreak of infectious disease —wiping out the entire species.