They are the small, active, red-faced, round-headed, long-tailed American Monkeys, which curl the end of the tail downwards, and yet use it to hold on by. They are smaller and more delicate than those already described; their teeth are smaller, and they have not large canines like the Mycetes. Vrolik, in noticing the gentle expression of their face, says their movements are graceful and gay, and their “manners a mixture of sweetness, cleverness, agility, and lubricity!” There is abundant proof to be obtained of their agility and intelligence, and, unfortunately for them, their gifts are valuable in the eyes of Monkey-trainers, and many a little pug, dressed up as a Highlander or soldier, who does tricks in the streets for the benefit of his master, once had a gay life of “lubricity” in the virgin forests of the Amazon. Bates, in his interesting work, “The Naturalist on the Amazon,” refers especially to the following species-- THE CAIARÁRA.[89] [Illustration: HOODED SPIDER MONKEY.] This (according to this author and admirable observer) is the light-brown Caiarára, and it is pretty generally distributed over the forests of the level country. He saw it frequently on the borders of the Upper Amazon, where it was always a treat to watch a flock leaping amongst the trees, for it is the most wonderful performer in this line of the whole tribe. The troops consist of thirty or more individuals, which travel in single file. When the foremost of the flock reaches the outermost branch of an unusually lofty tree, he springs forth into the air without a moment’s hesitation, and alights on the dome of yielding foliage belonging to the neighbouring tree--may be, fifty feet beneath--all the rest following the example. They grasp in falling with hands and tail, right themselves in a moment, and then away they go along branch and bough to the next tree. It owes its native name to the disproportionate size of the head to the body. It is very often kept as a pet in the houses of the natives, and Mr. Bates kept one for a year, and he thus writes about it:--“It accompanied me in my voyages, and became very familiar, coming to me always on wet nights to share my blanket.” It is a most restless creature, but is not playful like most of the American Monkeys, the restlessness of its disposition seeming to arise from great nervous irritability and discontent. Its actions are those of a wayward child. It does not seem to be happy even when it has enough of its favourite food--bananas; but will leave its own meal to snatch the morsels out of the hands of its companions. It differs in these morbid traits from its nearest kindred, for another Cebus found in the same parts of the forest--the Prego Monkey--is a much quieter and better-tempered animal. It is full of tricks, but they are generally of a playful character.