Snakes, turtles, lizards, alligators, and crocodiles are all cold blooded. They do not have an internal mechanism to control their body temperature. Their temperature is the same as the environment. If the temperature is cold then the snake will become inactive. In the same sense, if the temperature is really hot they could die.
Snakes can help control their body's temperature with behavior, as in basking in the sun.
At the hottest point of the day a reptile can raise his body to let the air cool him of f or go under something such as a rock. They can also pant to cool themselves. There are over 200 species of turtles, each being different in size as well as shape. Turtles can be found in many types of environments. People usually associate turtles with water but there are many species that never set foot in the water.