Human: What are the main differences between the crocodile and the alligator? Assistant: 
The main difference between a crocodile and an alligator is their size. Crocodiles can grow up to 20 feet long, while alligators typically stay around 12-15 feet in length. Crocodiles also have longer snouts than alligators and more prominent teeth. Alligators tend to be more aquatic than crocodiles, preferring to live near rivers and lakes.