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 c.o.c.kroaches, 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 ouist.i.ti, or tee-tee.

LEMURS

Relatives of the monkeys, and yet in many respects very different from them, are those very strange animals, the lemurs, which are sometimes called half-apes. The reason why that name has been given to them is this: Lemurs by the ancients were supposed to be ghosts which wandered about by night. Now most of the lemurs are never seen abroad by day.

Their eyes cannot bear the bright sunlight; so all day long they sleep in hollow trees. But when it is quite dark they come out, prowling about the branches so silently and so stealthily that they really seem more like specters than living animals.

When you see them close, they do not look very much like monkeys. Their faces are much more like those of foxes, and they have enormous staring eyes without any expression.

The true lemurs are only found in Madagascar, where they are so numerous that two or three at least may be found in every little copse throughout the island. More than thirty different kinds are known, of which, however, we cannot mention more than two.

The first of these is the ring-tailed lemur, which may be recognized at once by the fact that its tail is marked just like that of the marmoset.

The head and body are shaped like those of a very small fox, and the color of the fur is ashy gray, rather darker on the back, and rather lighter underneath. It lives in troops in Central Madagascar, and every morning and every night each troop joins in a little concert, just like the gibbons and the howlers.

But, oddly enough, this lemur is seldom seen in the trees. It lives on the ground, in rough and rocky places, and its hands and feet are made in such a way, as to enable it to cling firmly to the wet and slippery boulders. In fact, they are not at all unlike the feet of a house-fly.

The body is clothed with long fur, and when a mother lemur carries her little one about on her back it burrows down so deep into her thick coat that one can scarcely see it at all.

The ruffed lemur is the largest of these curious animals, being about as big as a good-sized cat. The oddest thing about it is that it varies so very much in color. Sometimes it is white all over, sometimes it is partly white and partly black, and sometimes it is reddish brown.

Generally, however, the shoulders and front legs, the middle of the back, and the tail are black, or very dark brown, while the rest of the body is white. And there is a great thick ruff of white hairs all round the face.

The eyes of this lemur are very singular. You know, of course, how the pupil of a cat's eye becomes narrower and narrower in a strong light, until at last it looks merely like an upright slit in the eyeball. Well, that of the lemur is made in very much the same way, except that the pupil closes up from above and below instead of from the sides, so that the slit runs across the eyeball, and not up and down.

The slender loris may be described as a lemur without a tail, It is found in the forests of Southern India and Ceylon. It is quite small, the head and body being only about eight inches long, and in general appearance it gives one rather the idea of a bat without any wings. In color it is dark gray, with a narrow white stripe between the eyes.

This animal has a very queer way of going to sleep. It sits on a bough and rolls itself up into a ball with its head tucked away between its thighs, while its hands are tightly folded round a branch springing up from the one on which it is seated. In this att.i.tude it spends the whole of the day. At night it hunts for sleeping birds, moving so slowly and silently among the branches as never to give the alarm, and always plucking off their feathers before it proceeds to eat them. Strange to say, while many monkeys have no thumbs, the slender loris has no forefingers, while the great toes on its feet are very long, and are directed backward instead of forward.

LEMUROIDS

There are two lemur-like animals which are so extraordinary that each of them has been put into a family all by itself.

The first of these is the tarsier, which is found in several of the larger islands in the Malay Archipelago. Imagine an animal about as big as a small rat, with a long tail covered thickly with hair at the root and the tip, the middle part being smooth and bare. The eyes are perfectly round, and are so big that they seem to occupy almost the whole of the face--great staring eyes with very small pupils. The ears are very long and pointed, and stand almost straight up from the head.

Then the hind legs are so long that they remind one of those of a kangaroo, while all the fingers and all the toes have large round pads under the tips, which seem to be used as suckers, and to have a wonderful power of grasp. Altogether, the tarsier scarcely looks like an animal at all. It looks like a goblin.

This singular creature seldom seems to walk. It hops along the branches instead, just as a kangaroo hops on the ground. And when it wants to feed it sits upright on its hind quarters, and uses its fore paws just as a squirrel does.

Even more curious still is the aye-aye, of Madagascar, which has puzzled naturalists very much. For its incisor teeth--the sharp cutting teeth, that is, in the middle of each jaw--are formed just like those of the rat and the rabbit. They are made not for cutting but for gnawing; and as fast as they are worn away from above they grow from beneath. All of its fingers are long and slender; but the middle one is longer than all the rest, and is so thin that it looks like nothing but skin and bone.

Most likely this finger, which has a sharp little claw at the tip, is used in hooking out insects from their burrows in the bark of trees. But the aye-aye does not feed only upon insects, for it often does some damage in the sugar plantations, ripping up the canes with its sharp front teeth in order to get at the sweet juices. It is said at times to catch small birds, either for the purpose of eating them or else to drink their blood. And it seems also to eat fruit, while in captivity it thrives on boiled rice.

The aye-aye is about as big as a rather small cat, and its great bushy tail is longer than its head and body put together. It is not a common animal, even in Madagascar, and its name of aye-aye is said to have been given to it on account of the exclamations of surprise uttered by the natives when it was shown to them for the first time by a European traveler. But it is more likely that the name comes from the cry of the animal, which is a sort of sharp little bark twice repeated.

Strange to say, the natives of Madagascar are much afraid of the aye-aye. Of course it cannot do much mischief with its teeth or claws; but they seem to think that it possesses some magic power by means of which it can injure those who try to catch it, or even cause them to die. So that they cannot be bribed to capture it even by the offer of a large reward. Sometimes, however, they catch it by mistake, finding an aye-aye in a trap which has been set for lemurs. In that case they smear it all over with fat, which they think will please it very much, and then allow it to go free.

The aye-aye is seldom seen in captivity, and when in that state it sleeps all day long.

CHAPTER IV

THE BATS

Next in order to the monkeys come the bats, the only mammals which are able to fly. It is quite true that there are animals known as flying squirrels, which are sometimes thought to have the power of flight. But all that these can do, as we shall see by and by, is to take very long leaps through the air, aided by the curious manner in which the loose skin of the body is fastened to the inner surface of the legs.

HOW BATS FLY

Bats, however, really can fly, and the way in which their wings are made is very curious. If you were to look at a bat's skeleton, you would notice, first of all, that the front limbs were very much larger than the hinder ones. The upper arm-bone is very long indeed, the lower arm-bone is longer still, and the bones of the fingers are longest of all. The middle finger of a bat, indeed, is often longer than the whole of its body! Now these bones form the framework of the wing. You know how the silk or satin of a lady's fan is stretched upon the ribs. Well, a very thin and delicate skin is stretched upon the bones of a bat's arm and hand in just the same way. And when the little animal wants to fly, it stretches its fingers apart, and so spreads the wing. When it wants to rest it closes them, and so folds it against its body.

Then you would notice that a high bony ridge runs down the bat's breast-bone. Now such a ridge as this always signifies great strength, because muscles must be fastened at each end to bones; and when the muscles are very large and powerful, the bones must be very strong in order to carry them. So, when an animal needs very strong breast-muscles, so that it may be able to fly well, we always find a high bony ridge running down its breast-bone; and to this ridge the great muscles which work the wings are fastened.

Something more is necessary, however, if the animal is to fly properly.

It must be able to steer itself in the air just as a boat has to be steered in the water. Otherwise it would never be able to fly in the right direction. So nature has given it a kind of air-rudder; for the skin which is stretched upon the wings is carried on round the end of the body, and is supported there, partly by the hind legs, and partly by the bones of the tail. And by turning this curious rudder to one side or the other, or tilting it just a little up or a little down, the bat is able to alter its course at will.

THE USEFUL CLAW

But you would notice something else on looking at a bat's skeleton. You would notice that the bones of the thumb are not long and slender, like those of the fingers, but that they are quite short and stout, with a sharp hooked claw at the tip. The bat uses this claw when it finds itself on the ground. It cannot walk, of course, as it has no front feet; so it hitches itself along by means of its thumbs, hooking first one claw into the ground and then the other, and so managing to drag itself slowly and awkwardly forward.

It is not at all fond of shuffling along in this way, however, and always takes to flight as soon as it possibly can. But as it cannot well rise from the ground it has to climb to a little height and let itself drop, so that as it falls it may spread its wings and fly away. And it always climbs in a very curious manner, with its tail upward and its head toward the ground, using first the claws of one little foot and then those of the other.

When a bat goes to sleep it always hangs itself up by the claws of its hind feet. In an old church tower, or a stable loft, you may often find bats suspended in this singular way. And there is a reason for it. The bat wants to be able, at the first sign of danger, to fly away. Now if it lay flat upon the ground to sleep, as most animals do, it would not be able to fly quickly; for it would have to clamber up a wall or a post to some little height before it could spread its wings. And this would take time. But if it should be alarmed while it is hanging by its hind feet, all that it has to do is to drop into the air and fly off at once.

BATS IN THE DARK

There is something else, too, that we must tell you about bats. They have the most wonderful power of flying about on the darkest night, without ever knocking up against the branches of trees, or any other obstacles which they may meet on their way. It used to be thought that this was because they had very keen eyes. But it has been found out that even a blind bat has this power, which seems really to be due to very sensitive nerves in the wings. You can feel a branch by touching it. But a bat is able to feel a branch _without_ touching it, while it is eight or ten inches away, and so has time to swerve to one side without striking against it.

THE WINTER SLEEP

Bats, like hedgehogs and squirrels, pa.s.s through the winter in a kind of deep sleep, which we call hibernation. It is more than ordinary sleep, for they do not require any food for months together, while they scarcely breathe once in twenty-four hours, and their hearts almost cease to beat. If the winter is cold throughout, they do not wake at all until the spring. But two or three hours' warm sunshine arouses them from their slumber. They wake up, feel hungry, go out to look for a little food, and then return to their retreats and pa.s.s into the same strange sleep again.

AN INTERESTING SPECIMEN