These days they are commonly found in Dipterocarp forests. Almost two-thirds of the habitat of the Sumatran Orangutan is forests on mountains, and on plateaus with altitudes ranging from 1000-2000 metres. The Bornean Orangutan�s habitat differs from that of the Sumatran in that they prefer lowland areas.

Orangutan habitat is dominated by Dipterocarp trees, though there are very few other similarities. Altitude ranges from 30 metres to 1000 metres above sea level. Early studies discovered that the number of Orangutans per km2 below 300m is 2.5 Orangutans, while above 300m, its 1.8 Orangutans. The density or Orangutans decreases when the altitude of their habitat increases. More Orangutans are found at 0-500m, while less at 1000-2000m. So Orangutans are more likely to live in lowland forest. So, what is making them live at greater altitudes? Human destruction has caused the Orangutans to flee their homes, while the humans destroy the forests and build there.