Gibbons

Part I of Essay
Apes have 13 species of large, highly intelligent primates, including Chimpanzees, Gorillas, , and Orangutans. Apes are sometimes confused with Monkeys, but unlike their smaller primate counterparts, apes do not have tails and their arms are usually longer than their legs. ....

Part II of Essay
.... the pygmy chimpanzee). Great apes are bigger than and also much less acrobatic. However, they are still good climbers. While orangutans spend most of their life in trees, where they use their long arms and dexterous hands and feet to grasp branches and vines, chimpanzees frequently come to the ground to feed. Gorillas are primarily terrestrial, but even fully grown adult males have been observed clambering among tree branches more than 15 m (49 ft) high. Chimpanzees and gorillas—the apes that spend the most time on the ground— ....