Human: What is the main difference between the alligator and the crocodile? Assistant: 
The main difference between an alligator and a crocodile is their physical characteristics. Alligators have more rounded snouts, shorter tails, and are typically larger than crocodiles. Crocodiles tend to be leaner with longer, more pointed snouts and longer, thinner tails. Additionally, alligators live in freshwater habitats while crocodiles inhabit saltwater environments.