Animals first developed fever as a response to infections: the higher body temperatures primed their immune systems. At the time, 600 million years ago, virtually all animal species were cold-blooded. They had to spend long periods of time in warm areas of their habitat to achieve fever-range body temperatures. A researcher believes that pathogens may be the reason why warm-blooded creatures first emerged.
From https://www.sciencedaily.com/releases/2019/06/190604172659.htm
From https://jamesjohnson10.blogspot.com/2019/06/pathogens-may-have-facilitated.html
from
https://jamesjohnson10.wordpress.com/2019/06/05/pathogens-may-have-facilitated-the-evolution-of-warm-blooded-animals/
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