The third difference: Habitat
"Typically, crocodiles are found around salt water or brackish areas, while alligators prefer fresh water. Crocodiles have salt glands on their tongue that allow them to excrete large amounts of salt, enabling them to thrive in salty environments. Somewhere along the way during evolution, alligators lost these glands and prefer to spend their time in fresh water. This likely plays a role in why crocodiles are found in many more parts of the world. Alligators are most often sighted in the southern states of Louisiana and Florida in the United States, and parts of China. Crocodiles populate America, Asia, Africa – and, of course, Australia." - petful.com
