If a humanoid species evolved on the dark side of a planet would they be 'warm blooded'? Other physiological factors?

I'm drawing from Norse mythology on light and dark elves to write about an alien race and planet with one humanoid 'tribe' residing on the sunlit side and the other on the dark side. I mention blood temps because I'm playing around with having the sunlit humanoids cold-blooded.

I'm finding the light side easier to contemplate as I know how sun=life and in what ways already. As for dark/I assume cold environments, I have no clue what that could possibly look like. Plant and or animal life, as well. Any and all advice greatly appreciated.

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If a humanoid species evolved on the dark side of a planet would they be 'warm blooded'? Other physiological factors?

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