Physical characteristics of 3-inch men

In my world, 3-inch humans live on an Earth-like planet. My question, provided by a comment on a previous question, is: What would an anatomically correct 3-inch human look like?

How strong would he be? Would he have different physical abilities? Would heat, cold affect him differently? Would he have to eat a lower or higher percentage of his body weight to thrive? And so on.

If these humans have evolved on this planet, would evolution have acted differently on them? For example, I have already made an assumption that they would reproduce at a higher rate given that the world would be a much more dangerous place for them.

Background:

Earlier, I asked how to calculate the weight of a 3-inch on an Earth-like planet. Thanks to members with math skills, I got a quick answer. Thanks guys! Answer: about a fifth of an ounce.

In the course of answering my question, it was suggested that a 3-inch man might possibly by 24 times as strong:

"A three inch tall man would be 0.0416666 as tall as a 72 inch man. Thus his leg bones would have 0.0017361 times the cross section of a 72 inch man's, and his volume and weight would be 0.0000723 that of the 72 inch man. Thus his leg bones would bear only 0.041666 the weight per unit of area of cross section, and so would his muscles. He would have about 24 times as much strength for his weight than a 72 inch man would have." --- M. A. Golding

Golding also suggested that evolution would likely give such a man much more slender bones, as it has kangaroo mice.

void_ptr asks "whether the 'perfectly scaled' human would have any issues with thermal regulation, nutrients storage and such."

Here is a link to that question; How much would a 3" human male weigh?

posted over 6 years ago

Adam Orth‭

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