Worldwildlife Sumatran Orangutan animals have found themselves on a precarious perch Sumatran orangutan Sumatran Orangutan Sumatran orangutans Sumatran orangutans orang-outan jeopardy Pongo abelii orangutans dying orangutans http://worldwildlife.org/species/sumatran-orangutan/ Sumatran Orangutan WWF Sumatran orangutan Sumatran orangutan depleting at an astonishing rate World Wildlife Fund Sumatran Orangutan