Garter snake, garden snake, gardener snake, and ribbon snake are some of the common names for the nearly harmless, small to medium-sized snakes belonging to the genus Thamnophis. Endemic to North America, species in the genus Thamnophis can be found from the Subarctic plains of Canada to Central America. The common garter snake, Thamnophis sirtalis, is the state reptile of Massachusetts. With no real consensus on the classification of species of Thamnophis, disagreement between taxonomists and sources, such as field guides, over whether two types of snakes are separate species or subspecies of the same species is common. Garter snakes are closely related to the genus Nerodia (water snakes), with some species having been moved back and forth between genera.
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