They use the resources around them. The ground is a great resource to be utilized.

The ground absorbs heat all Summer and slowly releases heat all Winter. Below the surface, at a certain depth that may differ from region to region due to climate and soil type, the ground doesn't freeze. It may even stay at temps that are warmer than one would think.

Also, certain geographic features may retain heat better through Winter. Snakes can figure this out.

In deserts during the hottest days that would kill any snake, underground retreats can be found that are at temps in the 60's. Depends on the geography, angle to the Sun, direction, etc. Snakes know this better than the people that keep them.

Snakes use their environment just as other animals use it. Maybe in different ways, but they use it to get what they need.

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