Answer:
They have to produce heat for keeping their body warm. Birds and mammals are warm-blooded animals that maintain a constant body temperature irrespective of their surrounding temperature.
- Warm-blooded animals such as birds and mammals maintain constant body temperature by cooling themselves when they are in a hotter environment and warming their bodies when they are in a cooler environment.
- Hence, these animals require more oxygen (O2) for more cellular respiration to produce more energy to maintain their body temperature.
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