<human>: Which is the most common difference between the crocodile and the alligator?
<bot>: The most common difference between a crocodile and an alligator is their size. Crocodiles can grow up to 20 feet long, while alligators are typically much smaller, with an average length of around 6-7 feet. Additionally, crocodiles have more rounded snouts than alligators, which helps them to catch prey in water.