But that is a thing which no monkey can ever do, because instead of having feet as we have, which can be planted flat upon the ground, these animals only have _hind hands_. There is no real sole to them, no instep, and no heel; while the great toe is ever so much more like a huge thumb. The consequence is that when a monkey tries to stand upright he can only rest upon the outside edges of these hand-like feet, while his knees have to be bent awkwardly outward. So he looks at least three inches shorter than he really is, and he can only hobble along in a very clumsy and ungraceful manner. But then, on the other hand, he is far better able to climb about in the trees than we are, because while we are only able to place our feet flat upon a branch, so as to stand upon it, he can grasp the branches with all four hands, and obtain a very much firmer hold. Chimpanzees are found in the great forests of Central and Western Africa, where they feed upon the wild fruits which grow there so abundantly. They spend almost the whole of their lives among the trees, and have a curious way of making nests for their families to live in, by twisting the smaller branches of the trees together, so as to form a small platform. The mother and her little ones occupy this nest, while the father generally sleeps on a bough just underneath it. Sometime quite a number of these nests may be seen close together, the chimpanzees having built a kind of village for themselves in the midst of the forest. A CLEVER SPECIMEN If you visit the zoölogical gardens in New York, London, or some other city, you may be quite sure of seeing one or more chimpanzees. They are nearly always brought to the zoos when they are quite young, and the keepers teach them to perform all kinds of clever tricks. One of them in the London Zoo, who was called "Sally," and who lived there for several years, actually learned to count! If she was asked for two, three, four, or five straws, she would pick up just the right number from the bottom of her cage and hand them to the keeper, without ever making a mistake. Generally, too, she would pick up six or seven straws if the keeper asked for them. But if eight, nine, or ten were asked for she often became confused, and could not be quite sure how many to give. She was a very cunning animal, however, and when she became tired of counting she would sometimes pick up two straws only and double them over, so as to make them look like four! "Sally" could talk, too, after a fashion, and used to make three different sounds. One of these evidently meant "Yes," another signified "No," and the third seemed to be intended for "Thank you," as she always used it when the keeper gave her a nut or a banana.