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Garter snakes are in the genus 'Thamnophis'.
The common garter snake is 'Thamnophis sirtalis'
T. sirtalis (Common Garter) is the the class Reptilia.
The common garter snake (Thamnophis sirtalis) is native to North America
The Common Garter Snake (Thamnophis sirtalis) averages in length from 0.7-1.3m (2-4ft).