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Side by side image of an alligator and a crocodile. Alligators have short fat snouts and crocodiles have long slender snouts. Posted by The Reptile Zoo

The most obvious way to discern the two reptiles is to stare down their sinister snouts. Alligators have U-shaped faces that are wide and short, while crocodiles have slender almost V-shaped muzzles. And if you’re daring enough, take a gander at their chompers. When an alligator closes its mouth, you tend to see only its upper teeth. Crocodiles on the other hand flash a toothy grin with their top and bottom teeth interlacing.

Many of the differences between the two center on their heads and mouths. Now, researchers from Japan have identified what they believe to be another feature that sets the reptiles apart: Alligators tend to have shorter humerus bones in their forelimbs and shorter femurs in their hind limbs than crocodiles