What the difference between a crocodile and an alligator?

They are both from the same family, crocodillians, but not the same animal. This article goes into more specific detail a href="http://www.wisegeek.com/what-is-the-difference-between-a-crocodile-and-an-alligator.htm" rel="nofollow"http://www.wisegeek.com/what-is-the-diff…/a Like big cats, if you shaved off all their hair, it would be very difficult to tell the difference between a tiger and a lion. The basic structure is very similar, just their behaviour and habitat that's different