. Aventures avec les animaux et les plantes. La biologie. Fig. 36 (ci-dessus) Aj7 copperhead adultes peuvent être deux ou deux et demi de mètres de long. Comme dans l'eau et rattlers vioc- casins, la tête est triangiilar. (U. s. bu- reau D'ÉTUDE BIOLOGIQUE) Fig. 37 (droit) Cette x-ray photo d'un serpent, montre que le réseau fédérateur et les côtes 7 ?iany qui aident dans la locomotion, (General Electric x-ray CORP.) rare dans le sud. L'eau- moc casin, qui vit dans les marais, est parfois appelé "cottonmouth" parce que l'intérieur de sa bouche est blanc. Le Coral Snake est plus petit que le mocassin d'eau et a peu de f

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. Adventures with animals and plants. Biology. Fig. 36 (above) Aj7 adult copperhead may be two or two and one half feet long. As in rattlers and water vioc- casins, the head is triangiilar. (u. s. bu- reau OF BIOLOGICAL SURVEY) Fig. 37 (right) This x-ray photograph of a snake shows the long backbone and the 7?iany ribs which help in locomotion, (general electric x-ray CORP.) uncommon in the south. The water moc- casin, which lives in swamps, is some- times called "cottonmouth" because the inside of its mouth is white. The coral snake is smaller than the water moccasin and has short fangs but when it bites, it hangs on, and sometimes its bite is serious. It often burrows in damp ground. Do Exercises 7 and 8. Peculiarities of snakes. Snakes have an enormously long backbone, consist- ing of many vertebrae each of which, except at the tail end, has a pair of ribs. Muscles connect the ribs with the scales on the lower part of the snake. By mov- ing the ribs, the scales are hooked onto the uneven surface of the ground, one after the other. Thus the snake really wriggles on its scales, but this happens. so fast and evenly that it looks like a smooth gliding motion. No snakes have legs, although the pythons (pie'thons) of Asia have tiny stumps of hind legs which are not used. Because of its peculiar formation, a snake's mouth can be opened so wide that it will admit an animal broader than the head of the snake. The animal must be swallowed whole since the teeth are not used for biting off or chew- ing food. At irregular intervals as snakes gro' they develop a ntx skin under- neatii the old one. The old skin is then shed as in the photograph. Figure 39. Snakes of other countries. While snakes in our part of the world arc not a real danger, in India, Central and South America, and other tropical regions. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i

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• bookcentury1900
• bookpublisherbostondcheath
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