Tree-mendous Orangutans live in rainforests in Borneo and Sumatra. They spend most of their time up in trees. They have long, powerful arms which they use to swing from branches and hang upside down. A bit like birds, orangutans build cosy nests up in the treetops and this is where they sleep. On The Menu Orangutans eat A LOT of fruit. They munch on mangoes and figs, as well as lychees, jackfruit and durians. Sometimes an orangutan will gobble up other stuff like leaves, bark, insects and bird eggs. Best Mum Ever Mummy orangutans are very caring and will carry their babies until they’re five years old! In fact, mums and kids spend all their time together and even sleep together until an orangutan turns 10. Adult males live alone and spend most of their time on their own. Sweet & Smart Most orangutans are very gentle. However, males can be noisy – they bellow or howl to tell other orangutans to keep away. Scientists say orangutans are very brainy, and they even use tools to cut into their fruit or to hunt for sap inside trees.