The Checkere Garter Snake (Thamnophis marcianus) is a species of garter snake native to the southern United States. The epithet marcianus is in honor of American Brigadier General Randolph B. Marcy, who lead surveying expeditions to the frontier areas in the mid 19th century. The Checkered Garter Snake is typically green in color, with a distinct, black checkerboard pattern down its back. It is capable of growing to lengths of 42 inches, but 28 inches is closer to average. They are typically found near permanent bodies of water, like streams and ponds. Their diet includes small frogs and toads, as well as small fish.