Four-month-old orangutan Rizki is seen at the Surabaya Zoo in Surabaya, Indonesia, on Oct. 10.
Interesting Orangutan facts: Orangutans are the world’s largest arboreal (tree—dwelling) mammals.
Orangutans arms are one and a half times larger than their legs.
Although not as strong as a gorilla, an orangutan is about seven times stronger than a human.
