Description - They are one of the most distinctive freshwater fish species. Alligator gars are the largest of all gar species with a head that looks very much like an alligator's. They can be distinguished from all other gars species by the two rows of teeth in the upper jaw, their short-broader snout, and their size when fully grown. The body is long, slender, and olive or greenish brown (sometimes black) along the back and upper sides with white to yellow bellies. The sides are mottled toward the head with large black spots toward the rear and on the rear fins. The young have a light stripe along their back from tip of snout to upper base of caudal fin.