Join an Expedition Sumatran Wildlife   Enjoy the Critically Endangered Sumatran Orang-utan (Orangutan), the Long tail and Pig tail macaques, Thomas Leaf monkeys, Langurs, Siamangs and of course the Sumatran Birds. The Sumatran orangutan is one of the two species of orangutans. Found only on the island of Sumatra, in Indonesia. This is a once-in-a-lifetime [...]