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Message: <blockquote data-quote="pemerton" data-source="post: 7469251" data-attributes="member: 42582">[MENTION=60326]heretic888[/MENTION] has already pointed out that the issues aren't with thigh bones.As well as the ankle, I would have thought that giants might have pelvis issues, and also problems with musculature given the human-like nature of their bipedalism. It's certainly the case that a human scaled up to giant size would be unable to stand or walk.I don't know whether a giant's lungs, given its proportionately human chest cavity, would give it enough oxygen, and whether its circulatory system would be up to the job of getting it to all the relevant parts of its body.I think its brain is quite a bit bigger than a T-Rex's, given it can speak and use tools and in some cases (eg some cloud giants, all storm giants) is cleverer than a typical human. I'm not a biologist, but I suspect that puts demands on its respiratory and circulatory system that are different from a T-Rex or even an elephant.Anyway, what I said was that I don't think a giant scorpion could respirate. I also think it would have trouble with its exoskeleton. Not having done my own research, nor studied much biology, I linked to a sensible-looking website which seemed to confirm these conjectures (including suggesting that 4-ish kg is the maximum feasible size for a land arthropod). Do you think that website was wrong?</blockquote>