How do reptiles regulate body temperature?

Reptiles regulate their body temperature through behavioral thermoregulation, meaning they adjust their position in response to environmental temperatures. They bask in the sun to absorb heat when they're cold and seek shade or burrow into cool areas to lower their body temperature when it's too hot. This reliance on external heat sources is a defining characteristic of ectothermic animals, as they cannot internally generate sufficient heat like mammals do^[1][2][3].

Reptiles utilize various strategies to maintain their ideal temperature. For example, they may open their mouths to release excess heat and alter their body posture to optimize heat absorption from sunlight or reduce it when in cooler surroundings^[1][4][5].