All my days in the field are special, but on occasion something really exciting happens - a fight between two male orangutans and we were able to film it." - Ashley Leiman
Why do some orangutans have fat faces? - Quora
Orangutan ladies prefer cheeky mates - The Washington Post
W3030 "Apes, Apes, Apes"
Orangutan | Smithsonian's National Zoo
Los Angeles Zoo - There are three species of orangutan: Bornean, Sumatran and Tapanuli. These apes are found only on the islands of Borneo and Sumatra. The largest arboreal mammal, they spend
Hybrid orangutan - Wikipedia
The Mystery of the Orangutan Flange | The Ark In Space