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Actually, reptiles are ectotherms which means their blood temperature is affected by their surroundings (and their behaviour to some extent). Their blood will be cooler in cooler environments. But they operate best with warmer blood like us, so they bathe in the sun and find sources of heat to warm themselves up.

Mammals, by contrast, are endotherms meaning our temperature is controlled internally to a greater extent. The disadvantage of this is that we burn a lot of our food just heating ourselves. Reptiles put more of their food into gaining mass.

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