poikilothermic

/ˌpɔɪkɪləˈθɜrmɪk/
adjective
  1. Having a body temperature that varies with the environment; cold-blooded.
    • Frogs are poikilothermic animals that rely on external heat sources.
    • The aquarium's poikilothermic fish need a heater to stay active in winter.
    • Scientists study poikilothermic creatures to understand how climate change affects wildlife.
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