Win the “King” Orangutang in Tanjung Puting National Park. 2005 photo.
Source

Orangutans are the most arboreal of the great apes and spend most of their time in trees. Males and females differ in size and appearance. Dominant adult males have distinctive cheek pads and produce long calls that attract females and intimidate rivals.

The name “orangutan” (also written orang-utan, orang utan, orangutang, and ourang-outang) is derived from the Malay and Indonesian words orang meaning “person” and hutan meaning “forest,” therefore orangutan means “person of the forest.”