I WONDER - How Do Reptiles Keep Warm? Me Pregunto - Cómo Se Mantienen Calientes Los Reptiles?

Reptiles rely on the sun to stay warm as they are cold-blooded, meaning their body heat is not internally generated. When overheated, they seek shade, water, or mud to cool down. Animals that regulate their temperature using external factors are known as ectotherms.

What external factors do reptiles use to regulate their temperature?

What are animals called that use external factors to regulate their temperature?