Cold vs. warm blooded animals
What's the difference between cold and warm blooded animals?
Cold-blooded animals are not able to regulate internally their body
temperatures -- their body temperature tends toward the temperature of their
surroundings. Warm-blooded animals are able to maintain a certain body temperature
over a wide range of temperatures in the environment. Warm-blooded animals are able
to do this by regulating the rate of metabolic heat production and the rate of heat
loss. For example, hair and body fat help to insulate the body to slow heat loss,
and evaporation of surface moisture cools the body.
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Update: June 2012