Sometimes these odd little animals are called night-monkeys, because all day long they are fast asleep in a hollow tree, and soon after sunset they wake up, and all night long are prowling about the branches of the trees, searching for roosting birds, and for the other small creatures upon which they feed. They are very active, and will often strike at a moth or a beetle as it flies by, and catch it in their deft little paws. And their eyes are very much like those of cats, so that they can see as well on a dark night as other monkeys can during the day. The eyes, too, are very large. If you were to look at the skull of a douroucouli, you would notice that the eye-sockets almost meet in the middle, only a very narrow strip of bone dividing them. And the hair that surrounds them is set in a circle, just like the feathers that surround the eyes of an owl. But perhaps the most curious fact about these animals is that sometimes they roar like jaguars, and sometimes they bark like dogs, and sometimes they mew like cats. There are several different kinds of these little monkeys, the most numerous, perhaps, being the three-banded douroucouli, which has three upright black stripes on its forehead. They are all natives of Brazil and other parts of tropical America. MARMOSETS One of the prettiest--perhaps the very prettiest--of all monkeys is the marmoset, which is found in the same part of the world. It is quite a small animal, being no bigger in body than a common squirrel, with a tail about a foot long. This tail, which is very thick and bushy, is white in color, encircled with a number of black rings, while the body is blackish with gray markings, and the face is black with a white nose. But what one notices more than anything else is the long tufts of snow-white hair upon the ears, which make the little animal look something like a white-haired negro. Marmosets are very easily tamed, and they are so gentle in their ways, and so engaging in their habits, that if only they were a little more hardy we should most likely see them in this country as often as we see pet cats. But they are delicate little creatures, and cannot bear cold. What they like to eat most of all is the so-called black beetle of our kitchens. If only we could keep pet marmosets, they would very soon clear our houses of cockroaches, as these troublesome creatures are correctly called. They will spend hours in hunting for the insects, and whenever they catch one they pull off its legs and wings, and then proceed to devour its body. When a marmoset is suddenly alarmed, it utters an odd little whistling cry. Owing to this habit it is sometimes known as the ouistiti, or tee-tee. LEMURS