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Joined 29 days ago
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Cake day: August 21st, 2026

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  • This is super cool and I think a nice opportunity to geek out a bit with some relevant knowledge I have:

    Warm-bloodedness isn’t as simple to split into on/off as most people might think. Both the hyrax and the naked mole rat – mammals by all accounts – have limited if any ability to regulate their own body temperatures. Meanwhile, traditionally cold-blooded animals like the great white shark or tuna are capable of producing body heat but just don’t regulate their core temperature the same way warm-blooded animals do.

    Those larger cold-blooded animals also benefit from being so large that they simply lose less heat because of the square-cube law and are capable of simply retaining body heat for an effective constant elevated temperature. AFAIK that’s where science has thought a lot of dinosaurs have fallen for a LONG while, but I think the traditionally warm-blooded hypotheses has been around for a few decades at this point.

    IIRC some hibernating mammals also stop thermoregulating while hibernating, so “warm-bloodedness” isn’t even continuous across individuals.