They are members of a group called the Great Apes. They are different to monkeys because they have no tail. Orangutans are very similar to humans. The Great Apes are humankind's closest living relatives. These are the only places in the world where orangutans live.
Orangutans live mainly in the trees, only occasionally coming to the ground.
In their nests. Usually they make a new one every evening. Orangutans also build nests in the daytime to rest and play in. A mother with young children might build 2 or 3 nests a day. They are woven in the branch of a tree and are often very well made, like a big basket.