Gibbon
Gibbons are sometimes wrongly taken as monkeys but they are small apes. The controversy often continues and so you will find information out there about them in both categories. You may hear them called the Lesser Apes at times too.
tropical rainforest
Mandrill
Many people mistake the Mandrill for the Baboon but they are different. Yet they do look similar to each other. They are members of the Old World Monkeys. In fact, they were once classified as Baboons.