poikilotherm
/ˈpɔɪkɪləˌθɜrm/
noun
- An animal whose body temperature changes with the temperature of its surroundings; a cold-blooded animal.
- Unlike mammals, a poikilotherm does not maintain a constant internal body temperature.
- The pond's fish, as poikilotherms, become sluggish when the water cools in winter.
- Lizards and snakes are poikilotherms that bask in the sun to warm up.
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