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It is my understanding that one of the reasons for why massive lifeforms (as depicted in fiction) aren't possible is the fact that the heat radiated by their body after a certain point would be too much for it to be survivable. Basically cooking them from the inside.

What is the maximum theoretical size a creature can realistcally be?

JBH
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Azumentris
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    To deal with heat, water has a great specific heat capacity, meaning it can hold a lot of energy—that is why we cook with it. I'd give your animal a second circulatory system that pumps water—or some mixture that may hold more energy—throughout the animal's body. Then, I suppose you'd have an animal that would constantly sweat and would constantly require water. –  Dec 30 '18 at 14:20
  • @B.fox ^ so, that would be the circulatory system then? :) – Pelinore Dec 30 '18 at 14:23
  • Also, these may be of interest to your question https://worldbuilding.stackexchange.com/q/316/44399 https://worldbuilding.stackexchange.com/q/317/44399 https://worldbuilding.stackexchange.com/q/1360/44399 https://worldbuilding.stackexchange.com/q/109716/44399 https://worldbuilding.stackexchange.com/q/120492/44399 should one or more of them not be a duplicate. –  Dec 30 '18 at 14:24
  • @B.fox Interesting, thanks for the links and the idea. – Azumentris Dec 30 '18 at 14:26
  • "thanks for the links and the idea" @Azumentris : I think you'll find the idea was fox polity pulling your leg, what he's described the circulatory system as possessed by all humans, mammals, lizards, etc on earth :) – Pelinore Dec 30 '18 at 14:29
  • @Pelinore I feel you read his comment wrong. He said a secondary one, acknowledging the existance of it on every animal and suggesting an additional one with the primary purpose of regulating heat. – Azumentris Dec 30 '18 at 14:33
  • And how would a secondary one help you shift more heat around the body than simply increasing the size of the existing one or the speed you pump it, I still think he was joshing you :) – Pelinore Dec 30 '18 at 14:36
  • @B.fox - That is a fine answer. Why not flesh it out and post it? – Willk Dec 30 '18 at 14:37
  • @Pelinore Well, I wasn't really. I'm suggesting an entirely separate circulatory system specifically for cooling. Perhaps it may pump faster than the other or perhaps doesn't need to be sweated, but instead may run through veins along giant fans or flaps or something that protrudes from the animal, to deliver the heat to the air. –  Dec 30 '18 at 14:37
  • 1 problem per question, please. – L.Dutch Dec 30 '18 at 14:37
  • "A creature" is a bit vague. We already have the Blue Whale and that is pretty big. It gets a lot of cooling when it is in Antarctica. As for "life forms", the Giant Redwoods are enormous http://greaterancestors.com/wp-content/uploads/2011/11/Tree-Height.jpg. Where does your creature live? Does it have to be any particular shape? – chasly - supports Monica Dec 30 '18 at 23:44

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