Also known as a pygmy chimpanzee, bonobos are a type of monkey or a native to certain regions of Africa. The bonobo is an endangered species and is found almost exclusively within the Democratic Republic of the Congo. Bonobos are rather closely related to humans, along with chimpanzees to which they are close cousins. The difference between chimpanzees and bonobos was most likely caused by the Congo River forming 2 million years ago; this type of monkey is not a good swimmer. Bonobos live on diets that are almost exclusively fruit, unlike chimpanzees which are generally omnivores. Bonobos are also one of the only species of animals that engages in sexual activity and even homosexual activity simply for the sake of entertainment. Since bonobos are an endangered species, sale of them is almost uniformly illegal.