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The biggest monkeys are apes.
An orangutan is an ape with long red hair.
A grown up male orangutan has cheek flaps. Getty Images
A grown up male orangutan has big cheek flaps on his face.
They make his voice louder when he calls.
Orangutans live in the tall treetops of thick jungles on just two islands.
Grown up orangutans live by themselves.
Orangutans eat fruit, leaves, buds and tree bark.
Sometimes they eat small insects or eggs.
A baby orangutan holding on to its mother's fur. Getty Images