Snakes are cold-blooded. They become cold if the temperature gets cold. Since snakes cannot maintain their own body temperature, they move to warmer climates to stay warm.
Snakes usually enter residences or underground tunnels to escape the cold. Most reptiles live in tropical conditions, but they can be found on all continents with the exception of Antarctica. Many live in grasslands, forests and swamps. Their preferred habitats are burrows and under rocks. Certain snakes brumate during times when the cold is unbearable. Brumating occurs when an animal remains awake but enters into a dormant phase. Snakes may brumate under fallen trees or rocks, and some snakes may brumate in large groups.