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Encyclopedia Britannica - Main :: AJA-ALL |
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ALLIGATOR (Spanish el lagarto, " the lizard ") , an animal so closely allied to the crocodile that some naturalists have classed them together as forming one genus. It differs from the true crocodile principally in having the head broader and shorter, and the snout more obtuse; in having the fourth, enlarged tooth of the under jaw received, not into an external notch, but into a pit formed for it within the upper one; in wanting a jagged fringe which appears on the hind legs and feet of the crocodile; and in having the toes of the hind feet webbed not more than half way to the tips. Alligators proper occur in the fluviatile deposits of the age of the Upper Chalk
Pliocene age; they are now restricted to two species, A. mississippiensis or lucius in the southern states of North
South
absence
armour
Mexico
Amazons
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