I am thinking about animals in these superhot regions. yes humans can turn the AC on but such temperatures are effectively death sentences for everyone except human. Now I do not know the exact WB temperature for each animals but 1) their body temperature equilibrium must be around current conditions. 2) for smaller (than humans) surface area/mass equation would tip towards for being worse for them in terms of survivability (think kids needing more layers).
I do not have a good feeling about this!