The Orangutan is the only surviving species of the subfamily Ponginae. They closely related to humans. Orangutans are plant eater, only eating bamboo, leaves, and fruit. They spend most of their life in the trees. They build nests to sleep in. They are critically endangered species because of the forest agitation in their homeland and poaching of there young. There are Orangutan orphanages and zoo programs to help and protect orangutans. Orangutans builds nests as a place to sleep over night. Orangutans uses calls to communicate with each other with short and long calls.