Advanced Geography . are hatched in its warm pouch, and there the little animals alsoremain till they grow strong. The Australian realm abounds in black swans, lyre birds, parrots,brush turkeys, pigeons, ducks, geese and other kinds of birds. Sheep and cattle are not native to Australia, but are nowcounted there in millions. The chief grazing regions are near the eastern ranges of thecontinent. .br- other Products of the Sea. Pearls come from some kinds of shellfishfinest are taken from pearl oysters. Theseare found not far from the shores of nearlyall tropical seas. Sponges are torn from rock


Advanced Geography . are hatched in its warm pouch, and there the little animals alsoremain till they grow strong. The Australian realm abounds in black swans, lyre birds, parrots,brush turkeys, pigeons, ducks, geese and other kinds of birds. Sheep and cattle are not native to Australia, but are nowcounted there in millions. The chief grazing regions are near the eastern ranges of thecontinent. .br- other Products of the Sea. Pearls come from some kinds of shellfishfinest are taken from pearl oysters. Theseare found not far from the shores of nearlyall tropical seas. Sponges are torn from rocks on thebottom of the sea at depths that vary froma few feet to several hundred. The spongesof commerce come largely from the Mediter- IIranean and Red seas, and from the Bahamaislands off the coast of Florida. Most of thefish which are used for food are caught nearthe shores of the sea or in rivers and lakes. Great turtles livewithin or near thetropics and form alarge part of thefood supply on manytropical COMMEECK 119 107. Domestic and Foreign Commerce. No state nor country produces all the tilings which itspeople need, but each has a surplus of some products. Neither tea nor coffee grows in our country. Brazil, however,is able to send usm coffee S ~-*i \inl ^M~ 108. Highways of Trade, — Water Routes. The principal highways of trade are oceans, railroads,rivers and canals. Besides the transportation on these great highways, we have learned that camels bear loads of salt, ivory and oil across broad deserts ; that reindeer drag sledges over the icy plains of northern Eurasia; that yaks toil up and down the Himalaya slopes; that llamas carry packs, or bundles of goods, over some parts of the Andes. These animals are of great service to man, for they can bear burdens in places where there


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