Controlling Internal Temperature
Mammals are ENDOTHERMS. they maintain a constant internal temperature despite changing environmental conditions by using PHYSIOLOGICAL processes and METABOLIC energy.
Reptiles are ECTOTHERMS, they have a limited capacity to regulate internal body temperature which therefore fluctuates with that of the surroundings. They may exert some control over body temperature through behavioural adaptations such as basking in the sun.
Large reptiles have more control over their body temperature than small ones. The bulk of the animal takes longer to warm up and cool down so their temperature does not fluctuate so…