The Sumatran orangutan (Pongo abelii) is the least common of the two species of orangutans. It lives on the Sumatra island of Indonesia. They are smaller than the Bornean orangutan. Baby Sumatran orangutans are often poached as highly prized Zoo Inhabitants. The poachers often kill the baby’s mother for no apparent reason. The Sumatran Orangutan is only found north of Lake Toba.