is connected to their fore gut by a small pneumatic duct, which allows them to breathe or gulp air when they break the surface, an action seen quite frequently on lakes in the Southern United States during the hot summer. The scales of alligator gar are not like the scales of other fishes, which have flexible elasmoid scales; their bodies are protected by inflexible and articulated ganoid scales that are rhomboidal-shaped, often with serrated edges, and composed of a tough inner layer of bone and hard outer layer of ganoin, which is essentially homologous to tooth enamel, making them nearly impenetrable. Taxonomy and evolution Lacépède first described the alligator gar in 1803. The original name was Lepisosteus spatula, but was later changed by E.O. Wiley in 1976 to Atractosteus spatula to recognize two distinct taxa of gars. Synonyms of Atractosteus spatula include Lesisosteus [sic] ferox (Rafinesque 1820), and Lepisosteus spatula (Lacepede 1803). Fossils from the order Lepisosteiformes have been collected in Europe from the Cretaceous to Oligocene periods, in Africa and India from the Cretaceous, and in North America from the Cretaceous to recent times. The Lepisosteidae are the only extant family of gars with seven species, all located in North and Central America. The fossil record traces the existence of gars like the Alligator gar back to the Early Cretaceous over 100 million years ago. Despite being a highly evolved species, alligator gar are often referred to as "primitive fishes" or "living fossils" because they have retained a few morphological characteristics of their earliest ancestors with seemingly few to no apparent changes, such as a spiral valve intestine, which is also common to the digestive system of sharks, an abbreviate heterocercal tail, and a swim bladder lung for breathing in both air and water. Feeding behavior Alligator gar are relatively passive, seemingly sluggish solitary fish, but voracious ambush predators. They are opportunistic night predators and are primarily piscivores, but they also ambush and eat water fowl, turtles, and small mammals that may be floating on the surface. Their method of ambush is to float a few feet below the surface, and wait for unsuspecting prey to swim within reach. They lunge forward, and with a sweeping motion, grab their prey, impaling it on their double rows of sharp teeth. Diet studies have shown alligator gar to be opportunistic piscivores, and even scavengers depending on the availability of their preferred