Part 44

=Kangaroo= (_Macropus giganteus_).--The fur of the kangaroo is greyish brown, somewhat lighter on the sides, while the lower parts are whitish. Its body is six feet long, and its tail nearly three feet. It inhabits Australia, and is found chiefly in New South Wales and Tasmania. It is the largest quadruped of that part of the globe. The front of its body is extremely slim in proportion to its hind quarters, and its hind legs are five times longer than the front ones. The kangaroo is a peaceful, shy, grazing animal. When startled it tries to get away from its pursuers by immense bounds. Its swiftness is so great that, at least across flat country, the fastest dog cannot equal it. But when it is brought to bay it will defend itself most pertinaciously with its sharp claws, and with powerful strokes of its tail. It will seize even large dogs with its fore feet, and tear open their breasts and abdomens, often carrying them to neighboring water to drown them. The flesh of the kangaroo is eaten; its hair makes a good fur.

=Koala= (_Phascolarctus cinereus_), a marsupial, restricted to eastern Australia. The toes of the fore-feet are in two opposable groups, of two or three, a characteristic not found in any other quadruped, but well adapted to grasping the branches of trees, on which the koala often hangs with its back undermost, like the sloth. There is scarcely any rudiment of a tail.

=Opossum= (_Didelphys virginiana_).--The American opossum is perhaps the best known and certainly not the least interesting of the pouched animals. It abounds in the warmer parts of North America, extending considerably north of Virginia. In form it is robust and in size about that of an ordinary cat. The color of its fine wholly fur ranges from white to black, and includes numerous varieties of intermixture. They have a long tail, which is almost destitute of hair, and is very useful from its prehensile nature, enabling the animal not only to hang by it, but also to climb and descend trees. They are sly and live chiefly in trees, lying up in the daytime, and at night roaming in search of their food, which consists of insects, small reptiles, birds’ eggs, etc. Caught red-handed in one of its marauding excursions, or captured under any other circumstances, the slightest blow causes it immediately to feign death, even to the extent of a protruding tongue and film-covered eyes. It may be battered almost beyond recognition and will lie where it has been flung without so much as the flicker of an eyelid. The moment, however, that its captor takes attention from it, the presumably dead animal regains its feet and effects its escape. “Possuming” is a slang term that has come into use to denote the acme of human artfulness and deceit.

A wonderfully pretty species of opossum which lives in Surinam is scarcely larger than a good-sized mouse, the body measuring only six inches from the nose to the root of the tail. It has scarcely a vestige of pouch, and so, robbed of this advantage, it carries its young on its back, curling its tail over, so as to allow the little ones to twist their tails around it. With her progeny thus secured from falling the mother can pursue her way in comfort. Even some of the larger opossums adopt this method of carrying their young.

BATS AND OTHER FLYING MAMMALS

A Bat is provided with true wings, with which it is able not merely to propel itself through the air for a longer or a shorter distance, but to fly like a bird by beating the air with its anterior members. The Colugo, in common with the Flying Squirrel and the Flying Phalanger, has the skin of the flanks extended in a manner capable of sustaining the animals, very much in the manner of a parachute, in an extended leap through the air. But bats possess the power of true flight. They move through the air with ease, and in pursuit of their insect-prey wheel and double and circle about with a nimbleness that the human eye can only follow with difficulty.

The bats are strange looking animals, being half mouse, half bird; their fore limbs are very long, and between these and the hind limbs, and also generally extending to the tail, there is a delicate membrane, which enables them to fly. Their eyes are small; their large ears erect; their teeth sharp. The flight of the bats is swift and noiseless, but not enduring. They could not, like the migratory birds, fly off in the autumn towards warmer countries. Therefore in the winter they retire into clefts and crannies, where they suspend themselves by the claws of their hind feet, and sleep until the rays of the spring sun warm their benumbed limbs. Our native bats feed upon insects, and are consequently useful. In the warm summer evenings they can be seen flitting around the blossoming trees in order to catch the honey-sucking moths. They do not build any nest for their young, but the latter cling between the folds of the wings of the parent animal, and are thus carried about by her on her excursions.

The best known of the foreign kinds are the vampire bat of South America and the colugo bat. In the flying lemur, or colugo, the hairy fold of skin begins behind the throat, includes fore and hind limbs as far as the claws, and extends along the tail to the tip. The animal has been observed to swoop over a distance of seventy yards. The flying lemurs are about twenty inches in length, are natives of the Indian Archipelago, inhabit lofty trees in dense forests, and feed chiefly on leaves and fruits, though said at times to eat insects, eggs, and even small birds. They are nocturnal in their habits, and very inoffensive, scarcely attempting to bite even when seized. Their voice resembles the low cackling of a goose.

THE SEALS (_Pinnipedia_)

In the seals the five toes of the limbs have become palmate, being joined together by a web; the hind feet have a backward, horizontal direction. Their food consists of small marine animals and plants.

=Seal= (_Phoca vitulina_).--The habitat of the common seal is spread over a large area, but it is chiefly found in the northern seas. It is nearly six feet long, and its fur is yellowish grey, sprinkled above with dark-brown spots. It has no exterior ear. To the inhabitants of the north the seal is a most useful animal; its flesh and fat form their chief food, with its oil they illuminate the long winter nights, its sinews they use as thread, from its bones they make various domestic implements, and with its fur they cover their tents and sledges. Seals are gentle animals, and when tamed exhibit great attachment to man. When wounded they snap savagely in all directions. Seal-hunting forms one of the most important branches of commerce among seafaring nations. Over a thousand vessels leave America every year to take part in seal-hunting; and as one vessel will sometimes capture nearly two thousand seals, some idea may be obtained of the immense number of these animals which are slain annually.

=Walrus= (_Trichechus rosmarus_).--This animal is from eighteen to twenty-two feet long, and weighs from two thousand to three thousand pounds. It is easily recognized by the long tusks in its upper jaw, which attain a length of eighteen to twenty-four inches.

The walrus lives in the northern Polar seas, where it is sometimes met with in herds of a thousand to two thousand head. They either swim about in the water or lie basking in the sun upon ice-floes. When they are about to sleep one remains awake as sentinel. They attract whole herds to their assistance by their terrific roaring, which can be heard for several miles; in all directions their black heads, with red, dilated eyes, and gleaming tusks, emerge from the water. The walrus is hunted for its tusks, skin and oil.

=ANIMALS OTHER THAN BIRDS THAT HAVE LEARNED TO FLY=

=Sea Lion= (_Otaria stelleri_).--The home of the Sea Lion is Bering Sea, and as far South as the Kurile Islands on the one side of the north Pacific and California on the other. In the latter case a rookery of sea lions is strictly preserved by the American Government, or probably long ere this the animal would have been exterminated in those waters, as it has been in many other regions after a century and a half of constant persecution.

The male sea lion, of eleven or twelve feet in length and a thousand pounds in weight, is yellowish-brown in color with shaded darker patches. There is a distinct mane upon the neck, which, with its upright posture, combines to give the creature its supposed leonine appearance. The males are fierce in aspect, and if hard pressed will turn and show fight. Old animals bellow like bulls; the younger ones bleat like sheep. They bolt their fish without mastication. The female is only about half the dimensions of the male, and is considerably lighter in color. The animal is useful only for its hide, flesh, and fat.

THE WHALES (_Cetacea_)

Under the general name of Cetacea, _i.e._, the Whales, are classed together a wonderful group of marine Mammalia, which includes not only the true whales, but also the Dolphin, Narwhal, Porpoise, and Grampus.

Notwithstanding their marked resemblance to fishes, the Cetacea possess the most indubitable mammalian character.

In the cetacea the bodies are elongated, fish-like, devoid of hair, and run out into a powerful caudal fin. The fore limbs are in the form of fins; there are no hind limbs. The cetacea are marine animals, and their food consists wholly of water animals and plants.

The whale is an astonishing animal, and in order that it may subsist a number of apparently contradictory conditions must be reconciled. It is a warm-blooded mammal, and yet spends its life wholly in cold water. In order to dive to great depths it must be able to make its body heavier than a corresponding bulk of water, and conversely at will make it lighter in order to reach the surface. Though breathing atmospheric air through nostrils, the animal can exist at a greater depth than where the pressure of the water would force its particles into solid oak, and yet no water can reach the whales’ lungs. It must be able to exist without breathing at all for at least the space of an hour. With the bones, ears, and eyes of a mammal it has to move, hear, and see as though it were a fish.

The “spouting” or “blowing” of the whale is simply an operation of purifying its blood. When the animal comes to the surface, it first expels the air in its lungs as it takes its first deep breath.

=Dolphin= (_Delphinus delphis_).--The dolphin is grey or greenish black on its upper parts, and white beneath. It generally attains a length of six feet, and lives in herds in all the northern seas. Hundreds of these swift animals are often seen around vessels, and amuse the passengers by their playful gambols. They feed chiefly on fish.

=Greenland Whale= (_Balæna mysticetus_).--This whale is greyish black on its upper parts, and white beneath. It is from forty-eight to seventy-two feet long, and weighs upwards of twenty thousand pounds. It is the largest of all living animals; a boat with six persons could enter its jaws. Its tongue is nine feet broad, eighteen feet long, and weighs about eight hundred pounds.

The whale inhabits the northern parts of the Atlantic and Pacific. It has been hunted for the sake of its blubber since the ninth century. A whale forty-eight feet long, and fourteen thousand pounds in weight, will furnish six thousand pounds of blubber, from which four thousand eight hundred pounds of oil will be obtained; there will also be over three thousand pounds of whalebone, which lies in the upper jaw in the place of teeth.

=Narwhal,= or =Sea Unicorn= (_Monodon monoceros_), allied to the dolphins and porpoises. The male has one--almost invariably the left--of the teeth or tusks in the upper jaw extraordinarily developed into a spirally furrowed horn of pure ivory from six to ten feet long. This is the longest tooth found in the Mammalia. The adult animal is from ten to sixteen feet long. It has a grey back, mottled with black, the under parts being much lighter, but also spotted. It has a blunt, short head, no dorsal fin and very small flippers, but is very active and a rapid swimmer. It is peculiar to the Arctic Ocean, though it occasionally strays as far south as the British seas. The oil is valuable and the flesh edible. The ivory is very fine, and in the castle of Rosenborg at Copenhagen is a throne of the kings of Denmark made of this substance.

=Porpoise= (_Phocæna communis_).--The porpoise, five, six, or seven feet in length, is common in the North Atlantic. Often off the British coasts a shoal of porpoises may be seen frolicking quite near to the shore. Passengers on board ocean-going liners are always interested in watching the sportive “black pigs,” as sailors call them, race along the side of the ship. The animals are captured chiefly for their oil, and the skin can be converted into useful leather.

=Rorqual= (_Balænoptera musculus_).--The common Rorqual is a typical species of the “finners,” as sailors term them; the generic name means “Finned Whale,” in reference to the small back fin that lies near the region of the tail. It attains an enormous size; one caught in the North Sea was ninety-five feet in length, twenty-two feet in width, and weighed over two hundred and fifty tons. Rorquals are the most widely distributed of all the larger Cetaceans; they are found nearly everywhere outside the Antarctic regions.

WHALE FISHERIES.--With the older method of whale-fishing the chief products were oil and whalebone. Recently the industry has been revolutionized, principally by Norwegians, and practically every part of the animal is used. For the new method a suitable island is selected, a cutting-up station constructed, and all whales killed are towed to the station and there drawn upon land to be dealt with. The modern whaling-vessel is a small and powerful steamer with a heavy harpoon gun mounted in the bows. The harpoon is a special kind of barbed spear. No boats are used, the steamer following the whales when sighted. By dealing with the carcase on shore all parts are now used, including the bone, blubber (or fat), the soft parts after the oil has been expressed being prepared as fertilizers. The flesh is asserted to be palatable and may ultimately be sold for food.

_THE BIRDS_

The birds have a hard, bony skeleton, and red, warm blood; they breathe by means of lungs, and lay eggs with hard shells. Their bodies are covered with feathers, their fore limbs are changed into wings.

HOW BIRDS COMPARE WITH MAMMALS

In some ways birds are the highest of the vertebrate animals. They represent the climax of that passage from water to land which the backboned series illustrates. Their skeleton is more modified from the general type than that of mammals; their arrangements for locomotion, breathing, and nutrition are certainly not less perfect; their body temperature, higher than that of any other animals, is an index to the intense activity of their general life; their habitual and adaptive intelligence is familiarly great, while in range of emotion and sense impressions they must be allowed the palm. It is, in fact, only when we emphasize the development of the nervous system and the closeness of connection between mother and offspring, that the mammals are seen to have a right to their pre-eminence over birds.

THE VOICE OF BIRDS

With few exceptions, birds have a vocal organ, and are able to produce more or less variable sounds. The organ is, however, wanting in the running birds, such as the ostrich, and in the American vultures. The sounds produced are almost as varied as the different kinds of birds, and an expert has little difficulty in identifying a great number of forms by their distinctive noises. It is among the so-called perchers, songsters, or Insessores, that we find song really developed and that for the most part in the males, and in highest degree at breeding-time.

HOW BIRDS ARE CLOTHED

The _integument_ differs markedly from that of other animals in being clad with feathers. Three distinct kinds of feathers are at once distinguishable--(_a_) the small hair-like downy rudimentary _filoplumes_; (_b_) the numerous smaller contour or covering _plumes_; and (_c_) the large strong quill-feathers or _pennæ_ on wings and tail. The ordinary feather consists of a quill at the base of a shaft up the center, and of the vane borne on the sides of the shaft. The vane consists of parallel barbs, which are linked together by small barbules. On the bare legs of many birds the feathers are replaced by horny scales, and the horny structures forming the beak and terminating the toes are very familiar.

THE BIRDS OF PREY

The birds of prey have a hooked, curved beak, at the base of which are the nostrils, surrounded by cere skin. They live chiefly upon warm-blooded animals, which they seize with their claws and tear in pieces with their beak. There are more than five hundred varieties, which are separated into day and night birds of prey.

Eagles, falcons, hawks, harriers, buzzards, and the like are adapted for the pursuit of prey not only by possession of strong, hooked beaks, powerful talons, and keen powers of vision, but also by the swiftness of their flight. Many of them--for example, falcons--are able to poise themselves, apparently motionless, in the air till some such prey as a young rabbit or small bird is discovered, and then swoop down upon the victim with almost incredible rapidity.

=Condor= (_Sarcorhamphus condor_).--Largest of vultures, averaging nine feet wing expanse, lives among the peaks of the Andes but descends for food. Its feet are not adapted for grasping, and it cannot truly perch nor carry objects when flying; it sleeps soundly, can be lassoed at night and kills small quadrupeds, besides feeding on carrion. The condor lays two white eggs four inches long, on bare rock, hatched in seven weeks. The young are brown and a year old before they can fly. The male is black with white ruff, has wing bars and tip of bill; wattles are present on the head and breast. The female lacks comb, wattles, and has less white. The young do not acquire full plumage for six years. The condor depends more on sight than smell in finding food.

=Eagle= (_Aquila_) is a name given to many birds of prey in the Falcon family. The golden eagle, the white-headed eagle, and the sea-eagles are characteristic examples. The falcon family includes over three hundred predacious birds, feeding for the most part on living animals, hunting by day, and living usually on exposed rocky places. The bill is powerful, but rather short, high at the root, and slightly curved; the partition between the nostrils is complete; the upper margin of the eye-socket projects; the head and neck are feathered; the soles of the feet bear large callosities.

Representatives of this noble genus are found in all parts of the world except the neotropical and Australian regions.

The GOLDEN EAGLE is a large and magnificent bird. The predominant color is dark, tawny brown, but the back of the head and neck are more tawny and look golden in the sunlight. The young birds have tails of a brighter color. The adult female measures about three feet in length; the male is rather less both in length of body and wing. The golden eagles have their homes in remote rocky regions, but often wander far in search of booty. They prey upon numerous mammals and birds, but are rarely willing to run any great risks in so doing. The nest, usually upon a rocky ledge, is large and roughly made. There are most commonly two eggs. Though a strong and majestic bird, it cannot be credited with much bravery. The occasional cry is loud and shrill, but with some hoarseness. The species is widely distributed in Europe, Asia and North America.

The crested eagles are found in parts of both hemispheres, and are in some species distinguished by tufts of feathers on the back of the head. The harrier-eagle is an Old-World bird represented in Europe, north Africa, and western Asia. The fishing eagle or fish-hawk is an almost cosmopolitan bird, with markedly piscivorous diet. The bald eagle has the tarsus feathered only halfway to toes; with white head and tail after third year. Its length is about 36 inches. The bald eagle is the emblem of the United States, feeds on fish, sometimes secured by robbing the osprey and sometimes found as carrion.

EAGLES AS EMBLEMS.--In the arms of the present German empire an eagle (with one head) sustains on its breast a shield containing the arms of Prussia. Austria has preserved the double-headed eagle of the earlier German empire. Russia assumed in 1472 the double-headed eagle under Ivan III. to signify that the czar sprang from the Greek emperors, who had borne it as a symbol since the partition of the Roman empire. A white crowned eagle in a red field was the shield of the kingdom of Poland. The arms adopted by the United States consist of a dark-brown eagle with outspread wings, having in one of its talons a bundle of arrows, in the other an olive branch, bearing on its breast a shield whose upper part is blue and under part silver, and crossed by six red vertical bars. In its beak it holds a band with the inscription _E. pluribus unum_, surmounted by thirteen stars, the original number of states.

=Falcons= (_Falco_) are birds of medium or small size, having short, strong beak, with a sharp hook at tip and a strong tooth on each side of upper mandible; legs short and strong, middle toe long, claws much curved and sharp, tail short and stiff, wings long and pointed. There are about fifty species, some known as hawks. True falcons, in hunting prey rise high in air above and swoop down. Hawks chase the prey near the ground. The most common falcon is dark-bluish above and white below with bars; the young are brownish above and streaked below. The largest falcon is found in the Scandinavian Mountains. Among small falcons are the sparrow-hawk of the United States and the kestrel of Europe. They feed on mice and insects. Most falcons prey upon birds, attacking some even larger than themselves. They, at one time, were trained for hunting the heron, sparrow, etc., in the sport known as falconry.

=Hawks= have the upper mandible not toothed, and the wings short, rounded, and concave below. They do not easily soar or glide.

HENHAWKS comprise chiefly the rough-legged hawk and the red-shouldered hawk. The first rarely, and the second never, takes chickens; they prey rather on noxious insects, mice, etc. The sharp-shinned hawk, length twelve inches, and Cooper’s hawk, eighteen inches, are rufous on breast and dusky above, with dark bars on the tail. These useful buzzards last mentioned should be protected.

GOSHAWKS (_Astur palumbarius_) is found in almost all parts of Europe. It generally inhabits thick woods in the neighborhood of fields and meadows, and builds its nest on the topmost boughs of a lofty tree.