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Alligators and Crocodiles Alligators and crocodiles are reptiles that have four short legs and a long tail. These animals look alike but one way to tell the difference is to look at their mouths. When a crocodile’s mouth is closed, you can see its bottom teeth ( left ). An alligator’s teeth don’t show when its mouth is closed ( right ). © Microsoft Corporation. All Rights Reserved./Bob Citron/Getty Images; Edward Robinson/Oxford Scientific Microsoft ® Encarta ® 2009. © 1993-2008 Microsoft Corporation. All rights reserved. Alligators and Crocodiles Alligators and crocodiles are reptiles that have four short legs and a long tail. These animals look alike but one way to tell the difference is to look at their mouths. When a crocodile’s mouth is closed, you can see its bottom teeth ( left ). An alligator’s teeth don’t show when its mouth is closed ( right ). Alligators and Crocodiles Alligators and crocodiles are reptiles that have four short legs and a long