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Definitions:
endothermos: An ectotherm (reptile/amphibian) relies primarily on its external environment to regulate the temperature of its body.
ectothermos: Endotherms (birds) are able to regulate their body temperatures by producing heat within the body.
Examples:
endothermos: People, polar bears, penguins, and prairie dogs, like most other birds and mammals.
ectothermos: reptiles, amphibians, crabs, and fish.
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