Quote:
Originally Posted by Flyndaran
Realistically, everything animate and obeying even the most basic of thermodynamics will produce some waste heat.
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However, inanimate objects normally have a temperature higher than zero kelvin and thus emit some electromagnetic radiation, too. And a lot of organisms have metabolic activity that produces just enough heat to keep them in thermal equilibrium with their surroundings. Mammals and birds spend a huge amount of energy keeping their body temperature high to support fast chemical reactions; organisms that don't do this will fade into the background.