* Orangutans are apes, not monkeys. They belong to the family Hominidae, which also includes humans, gorillas, and chimpanzees. Monkeys belong to a different family, Cercopithecidae.
* Apes and monkeys have distinct features. Apes generally lack tails, have larger brains, and have more complex social structures than monkeys.
So, while orangutans are large primates, they are more closely related to humans than to monkeys.