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Trivia Tidbit: Alligators and crocodiles both are in the same biological order (crocodylia) but belong to different biological families. How can one tell them apart? The San Diego Zoo explains that alligators tend to have U-shaped jaws while crocodiles have sharper, V-shaped ones; the fourth tooth on the lower jaw of crocodiles is exposed when their mouths are closed — this is not so for alligators; and while both have glands on their tongues which allow the beasts to expel excess salt, the crocodiles’ work better, so they prefer saltwater environments while alligators prefer freshwater ones. via