Читать книгу The Circle of Knowledge: A Classified, Simplified, Visualized Book of Answers - Various - Страница 259

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 [206] 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

FLYING-FOX WITH OUTSPREAD WINGS. ITS ANCESTORS ONCE WALKED THE EARTH LIKE OTHER MAMMALS
SQUIRREL-LIKE PHALANGER
A FLYING FROG	COMMON BAT
It glides through air by means of the membranes uniting the toes, but is not capable of sustained flight.	The bat is the only animal, outside of the birds, that can really fly in the true sense.

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 [207] 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.