Would it be more efficient to have wings on our arms or our backs?

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animals wings, wings arms. @ bats, 1 in reference. if humans evolved flight capacity, keep our nimble hands (with opposing thumb) @ end of our arm-turned-wing. tails offer balance , stability. don't need them walking/running stability, need them aerodynamic stability.

humans require high metabolic rates support energy demands of brain. add additional metabolic demands flight difficult. need sacrifice lot of our present musculature.

this " if " question


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