Input (grade 13): An alligator is a crocodilian in the genus Alligator of the family Alligatoridae. There are two extant alligator species: the American alligator (Alligator mississippiensis) and the Chinese alligator (Alligator sinensis).
Output (grade 12): The genus Alligator has two living species, the American Alligator and the Chinese Alligator.