Genus Thamnophis is a group of nonvenomous snakes, commonly known as garter snakes. Garter snakes are found throughout North America, and they vary in color and pattern depending on the species and location. Some common synonyms for genus Thamnophis include ribbon snake, grass snake, and water snake. These snakes are often found in or near water and are great swimmers. Garter snakes feed on a variety of prey, including insects, fish, and other small animals. Although they are not typically dangerous to humans, garter snakes can emit a foul-smelling odor when threatened or disturbed. Overall, genus Thamnophis is a fascinating group of snakes with many unique characteristics.