The mammals and birds are warm-blooded ("homeothermic"). All chemical reactions, including those involved in life, take place faster the higher the temperature and cold-blooded or "poikilothermic" organisms are restricted by having their body teperature restricted to that of their immediate environment.
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| Fish |
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Certain species of Tuna or Tunny maintain an elevated core temperature but the Great White Shark is the only known truly endothermic or warm-blooded fish. |
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