The common garter snake (Thamnophis sirtalis)is found throughout North America. In the South, it is active year round. In the North, it is active during the warmer months but hibernates during the winter. It is commonly found basking on warm rocks during cool mornings. This lifestyle indicates the snake is probably:

Question

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The fact that the common garter snake is basking on warm rocks during cool mornings suggests that it is regulating its body temperature by taking advantage of external sources of heat, indicating that it is an ectothermic animal.

The Common Garter Snake (Thamnophis Sirtalis)is Found Throughout North America