How to warm blooded animals stay the same temperature?
Heat is a form of energy. When you digest your food, your body takes the
energy out of the food to help "run your body". If you are warm blooded,
some of that energy is converted to heat to keep your body the same
temperature all the time. If an animal is cold blooded, they take on the
temperature of their surroundings so they don't have to use food energy to
keep warm. This means they don't have to eat as often. But it also means
that when it is cold, their bodily functions slow down. There is good and
bad to both methods.
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Update: June 2012