Unlike many snakes and invertebrates, male crocodilians get significantly larger than the females! Nile crocs are the second largest reptiles on earth, (salt water crocs are first). Gators are much smaller than nice crocs so the female, as seen here is dwarfed by one. Even though they are related, they could not mate. You can’t have a Nile crocodile as a pet, but in some places you can have an alligator as a pet. You shouldn’t though!
The size difference between a male Nile crocodile and a female alligator is unbelievable.