They live alone in large territories. The only long-lasting orangutan social group is the mother and offspring, who live together for about 7 years. When mating, the male and female orangutan stay together for only a few days. These nests are made out of leaves and branches. Nests are shared by a mother and her nursing offspring.
Orangutans often nap in the afternoon after a morning spent obtaining food.
These calls help the male claim his territory, call to females, and keep out intruding male orangutans. Males have a large throat sac that lets them make these loud calls. Orangutans do not swim.