of course not they are reptiles and have not changed a lot since the dinosaur times
Additional answer
In fact, no aligators, American or otherwise, are mammals. Neither are crocodiles.
No, alligators are not mammals, they are reptiles.
smaller animals tigers: large mammals alligators: fish birds mammals
Alligators* are not mammals. They are reptiles.
Adult American alligators have very few predators, but they do get eaten by black bears on rare occasions. A bigger alligator will occasionally eat the adult alligator. The youngs get preyed on by big fish, wading birds, monitor lizards, and water snakes.
They eat mammals and fish or anything that steps in the water but poisness.
No, alligators are reptiles.
Whatever they can catch.
Alligators hatch from eggs. Tigers are born alive, like other mammals.
Alligators have a 4 chambered heart, just like birds and mammals
Technically, no. They're closely related to alligators, but aren't actually alligators. Gharials (and alligators, and crododiles) are all crocodilians.
For protection against other gators and land mammals
Yes - Crocodiles, Alligators, Caimans & Gharials all prey on fish & mammals.