Large reptile, shaped like a lizard, with a rounded snout, 80 teeth and scaly hide. Typically 8-12 feet in length and 400-500 lbs., though can reach 1,000 lbs. How can you tell them apart from crocodiles? Check for these signs: (1)The alligator's snout is wider. (2)No teeth show when its mouth is shut. (3)The gator is gray-black while the croc is brown.