Every day, morning and evening, the Howlers assemble in the forests, and one of their number, taking his station upon a lofty tree, makes a sign with his hands, as though inviting the others to sit around him. He then begins a sort of discourse, in a voice so loud and harsh that any one might suppose that they were all screaming together, although one only is thus employed; when this one leaves off, he gives a signal to the others, who immediately set up a cry in full chorus, until their leader commands silence, and is instantly obeyed. The first speaker, or rather howler, then begins again, and it is only after several repetitions of this that they cease from their discordant yellings. These Monkeys live in large troops and only frequent the highest trees, from which they rarely come down. They leap from branch to branch with wonderful agility, and, contrary to the habits of most Quadrumana, seem to prefer those parts of the forests which are in the vicinity of rivers or swamps. They live almost entirely upon the fruits and foliage of the trees around them, and are said occasionally to catch and eat insects. The whole race is remarkably sullen, lazy, heavy and of disagreeable nature; they are tamed with difficulty. And it is not often that this is attempted, for even if they were good-natured and intelligent, they would not make desirable pets on account of their voice. THE SPIDER MONKEYS. These curious little Monkeys are found in nearly all parts of South America, and they live in troops, making their homes in trees. They feed on the insects which are usually found in great quantities in many of the South American trees, and occasionally they will descend to the ground, in search of small Fish and Molluscs which they find in the mud on the banks of the rivers. It is said that they even venture on the beds of the rivers when the water is low, and capture the oysters, and they are very quick in learning how to open the shells and take out the oyster. These Monkeys are distinguished by their fine silky hair, their strong tails, which they use in climbing and in swinging themselves from limb to limb, and the fact that they have no thumbs; but only the four fingers on each hand. This peculiarity has given them the Greek name by which the family is usually classified which means imperfect, but the name Spider Monkey has been given to them because of their long, slender limbs and their slow, queer manner of walking, which sometimes gives them the appearance of huge spiders. THE WEEPING MONKEYS. [Illustration: WEEPING MONKEYS.] The Weeping Monkeys are smaller, but not so slim as the Spider Monkeys. They live in the forests of Guinea and Brazil, and flock together in great troops. They will eat snails and small Birds when they can get them, but their principal food is the abundance of fruits found among the trees where they make their home.