Advanced Geography . ABITS AND USES. Whales that live in polar seas have thick layers of fat, or blubber,to keep the icy water from chilling their muscles. Seals are covered with warm fur, rob-ins with lightfeathers, alpacasr^^V with curly wool, Every kind of creature has the kind of covering that They may be swift and strong, but they cannot live insuits its native home. regions that do not supply their food. The warm parts of the Old World are the home of the elephantand the giraffe. What prevents these animals from reaching SouthAmerica ? Why cannot cattle cross wide deserts ? Many animals


Advanced Geography . ABITS AND USES. Whales that live in polar seas have thick layers of fat, or blubber,to keep the icy water from chilling their muscles. Seals are covered with warm fur, rob-ins with lightfeathers, alpacasr^^V with curly wool, Every kind of creature has the kind of covering that They may be swift and strong, but they cannot live insuits its native home. regions that do not supply their food. The warm parts of the Old World are the home of the elephantand the giraffe. What prevents these animals from reaching SouthAmerica ? Why cannot cattle cross wide deserts ? Many animals have been taken by man to new homes. Cattle, sheep, hogs and horses have been shipped from Europeacross the ocean, and now thrive in many parts of America. Count-less birds have been carried to places far from their native haunts. Most animals have a much wider range than former are always free to move from place to place asseasons%-fev* change or asperiods ofdrouth comeon. The chiefbarriers totheir travel. lobsters with strong shells. Each kind of coveringis suited to certain haunts. Animals make their homes in or near theplaces that supply their food. Moths of many kinds lay eggs on the leaves which willform the food of the larvae when the eggs hatch. Spidersweave webs in places where flies and other insects flit about. Many birds build their nests in fruit trees. Most woodpeckersmake their homes in decaying trees where there are generally manyinsects. Frogs lay eggs in ponds where their tadpoles can feed. Among wild animals there is always a struggle for foodand for life. Tigers pounce upon deer and cattle ; many birds feed on wormsand insects ; owls destroy field mice ; polar bears catch seals andfish. Each creature may be the prey of some other. Every animal has some means of defense or escape. The chamois leaps from crag to crag ; the rattlesnake strikeswith poison fangs ; the deer runs swiftly; the frog dives intowater ; the ostrich kicks and runs. Nearly all


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