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Garter Snakes

Thamnophis (genus), “Graden”, “Garden Snake”, “Gardener Snake”, “Ribbon Snake”

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Garter snake is a common name for generally harmless, small to medium-sized snakes belonging to the genus Thamnophis. Endemic to North and Central America, species in the genus Thamnophis can be found from the subarctic plains of Canada to Costa Rica. Garter snakes vary in length from 46 to 137 cm (18 to 54 in), and weigh approximately 140 g (5 oz). 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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