Birds and mammals have a more active lifestyle than reptiles due to:

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Birds and mammals have a high, constant body temperature (endothermy) and insulation over their body surface (fur or feathers). This allows them to be more active and maintain their body temperature in a wider range of environments. Reptiles are ectothermic, meaning they rely on their environment to regulate their body temperature and have a slower metabolism, which makes them less active. Internal fertilization is a characteristic seen in some reptiles, mammals, and birds, but alone is not responsible for their level of activity.

Birds and Mammals Have a More Active Lifestyle Than Reptiles