What is the difference between an alligator and a crocodile? If you are in fresh water, it is probably an alligator you see. If in salt water, it is probably a crocodile. There are other differences that you may not notice if you are running away from one! The shape of the head is narrower on crocs and alligators hide their teeth when the mouth is closed. There are newly discovered differences that explain why crocodiles can gallop across land to chase prey—they have longer arm and leg bones! Regardless of differences, these ancient creatures are awesome predators at the top of the food chain.
See and read more at: https://www.nytimes.com/2018/03/12/science/alligators-crocodiles-differences.html