Switching between poikilothermic and homeothermic metabolism
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I am designing a mammal living in a warm environment (like a warm desert) which has developed a switchable metabolism, so that during the day it is cold blooded and during the night (when it is colder) it goes on warm blood mode.
This switching roughly halves its energy demand (half of a day it doesn't need to warm itself up, heat is provided by the environment) and gives it an advantage in an environment with scarce resources.
Would this be possible, or do I need to make some other assumptions?
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