Chimpanzees, of which there appear to be at least two species, range through the tropical forest-zone of Africa from the west coast to Uganda.
In central Africa the chimpanzees assume more or less marked gorilla-like traits.
Still the large size and prominence of the ears proclaim that both "Mafuka" and "Johanna" were chimpanzees and not gorillas.
A gorilla-like feature in "Johanna" is, however, the presence of large folds at the sides (ala) of the nostrils, which are absent in the typical chimpanzee, but in the gorilla extend down to the upper lip. Chimpanzees exhibit great docility in confinement, where, however, they seldom survive for any great length of time.
Some of the features distinguishing the gorilla from the mere gorilla-like chimpanzees will be found mentioned in the article PRIMATES.
In the west and south-west are the vast primeval forests of Budonga and Bugoma, containing large chimpanzees and a peculiar sub-species of straight-tusked elephants (only found in Unyoro).
The forests contain many kinds of monkeys, including huge chimpanzees; antelope are widespread but rather rare.
Equatorial Africa, and the chimpanzees of W.
For the distribution of the various families and genera the reader may be referred to the article Primates; and it will suffice to mention here that while chimpanzees and baboons are now restricted to Africa and (in the case of the latter group) Arabia, they formerly occurred in India.
Each of these apes resembles man most in some one physical characteristic: the gibbons in the formation of the teeth, the orangs in the brain-structure, the gorillas in size, and the chimpanzees in the sigmoid flexure of the spine.