These ancient reptiles have often been confused with one another because of their similar appearances. Though in the wild, you would rarely naturally see the two species together. The alligator only exists in the United States and China, whereas crocodiles are found across the globe, inhabiting 5 of the 7 continents. They also inhabit two very different niches. Beside location, you can tell the two species apart by the shape of their snout (nose). Alligators have a wider, U shaped snout; while crocodiles have a narrower, V shaped shout. Since crocodiles have that narrow snout, some of their teeth are exposed when their mouth is closed, resulting in a candid croc smile.