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Alligators differ from crocodiles principally in having wider and shorter heads, with more awkward snouts; in having the fourth, enlarged tooth of the under jaw received, not into an external notch,.
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 in lacking a Crocodiles have a uneven outer border which appears on the hind legs and feet.
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Alligators strongly preferring fresh water
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 In general, crocodiles are more dangerous to humans than alligators. crocodiles can tolerate saltwater due to specialized glands for filtering out salt. Alligator is a family of alligators and caimans.
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           BLACK CAIMAN                                          CHINESE ALLIGATOR