Warm blooded: the body maintains a specific internal temperature and dies if the temperature drops by more than a slight amount.
Cold blooded: the body’s temperature vary with the environment and can fluctuate widely.
The big advantage to warm-bloodedness is the ability to maintain a high level of activity in a wide variety of temperature. But that comes at the cost of needing a lot more food to be eaten.
The big advantage of cold bloodedness is not needing to eat food to maintain body temp, but that comes at the cost of not having much motion or energy at low temps.
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