CROCODILIANS American Alligator, Alligator mississippiensis Size: 10-20 ft. (3-6 m) Description: Large black reptile is distinguished by its broad, rounded snout. Habitat: Freshwater lakes, bayous, marshes and swamps. Comments: Populations have slowly recovered from overhunting in the early 20th century. The endangered American crocodile (Crocodylus acutus) inhabits saltwater shorelines in extreme southern Florida. It is distinguished from the alligator by its green color and narrow, pointed snout.Kavanagh, James is the author of 'Nature Of Florida An Introduction To Familiar Plants, And Animals, & Outstanding Natural Attractions', published 2006 under ISBN 9781583553022 and ISBN 1583553029.