Quote:
Originally Posted by StrongInTheArm
What is the difference between a crocodile and an alligator?
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While often confused with each other, alligators and crocodiles belong to two quite separate taxonomic families, and are as distinct from one another as humans are from gorillas. As for appearance, one generally reliable rule is that alligators have U-shaped heads, while crocodiles' heads are V-shaped.
source and more info:
http://en.wikipedia.org/wiki/Crocodile