Orangutans are the world’s largest tree-dwelling mammals. Males develop large cheek pads known as flanges when they are 15-20 years old.
Bornean orangutans have broader faces, shorter beards, and darker color compared to Sumatran orangutans. Three subspecies are recognized, each localized to different parts of the island: Northwest Bornean, Northeast Bornean and Central Bornean orangutans.
Orangutans omnivores so they eat both plants, fruits, and insects but sometimes they also eat soil to obtain minerals for their diet.