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Certain small birds and bats (which are mammals) are now considered to be not completely warm blooded, since they allow their temperature to drop during their sleep period. Also, some fish are not considered to be completely cold blooded, since they manage to warm certain parts of their bodies, such as the eyes and brain.

All the little organisms that do not have a circulatory system are sometimes called cold blooded, even if they don't have any blood! It is a way of saying they are not warm blooded, they cannot keep themselves warmer than their surroundings.

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13y ago

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