I don't know the science involved, so I'm hoping someone else does. But is it more probable a giant creature of that size and capability would be more likely to exist if it were, say, a silicon-based lifeform? Or maybe arsenic? I'm not sure what element would make the most sense on the periodic table, or if it doesn't make a difference. I'm just trying to find a potential way around stuff like, say, kaiju would probably be crushed under their own weight, their lungs would collapse, their metabolism would be out of control, etc.

  • $\begingroup$ I'm not sure science-based is an appropriate tag. I think reality-check matches the question better. $\endgroup$ – user535733 Oct 12 '18 at 19:30
  • $\begingroup$ What kinds of Kaiju are we talking about? How tall are they? Do they Fly and shoot laser beams? $\endgroup$ – Sasha Oct 12 '18 at 19:32
  • $\begingroup$ @user535733 science based is fine. This touches math, physics and biology. $\endgroup$ – Renan Oct 12 '18 at 19:32
  • $\begingroup$ Could the kaiju bodies be full of pockets of helium or hydrogen, to counteract their weight? $\endgroup$ – BrettFromLA Oct 12 '18 at 23:52

We've had thousands of questions where the square-cube law foils the author's intent. I could go on and on about that with a lot of prose, but these days I find comics more concise and educational.

Science ruins all the fun

Source: https://www.smbc-comics.com/comic/gojirasaurus

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    $\begingroup$ Eventually all human knowledge will be distilled into the form of comics... $\endgroup$ – Joe Bloggs Oct 12 '18 at 19:46

You are right that standard earthly lifeforms cannot grow to Kaiju size. In addition to your points, breathing and thermoregulation will be a problem.

Unfortunately, we do no know much about silicon-based lifeforms. They might face the same scale problems.

One workaround might be based on the world of Pacific Rim movie, where Kaiju are created by advanced alien race, and sent in to wreck our cities. These Kaiju can be biomechanical creatures: most of its large body produced industrially and powered by some sort of fuel. But this body is 'piloted' by a living brain, getting info from biological senses, and issuing commands via nerves. The mechanic body will run out of fuel eventually, but Kaiju will be destroyed by humans even faster.

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    $\begingroup$ Mechanical bodies face the same scale problems too. $\endgroup$ – user2357112 Oct 13 '18 at 0:20

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