Garter snakes spread throughout North America. The common garter snake (Thamnophis sirtalis) is the only species of snake to be found in Alaska, and is one of the northernmost species of snake in the world, possibly second only to the crossed viper, Vipera berus. The genus is as far ranging due to its less discriminant diet and adaptability to different biomes and landforms, with varying proximity to water. However, in the western part of North America, these snakes are more aquatic than in the eastern portion. Northern populations hibernate in larger groups than southern ones.
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