Fuck AI

optimal for two legged motion

Arguable, it's an evolutionary oddity that we developed bipedalism and it turned out to be somewhat beneficial for survival and we are the only ones who walk vertically.

Bipedal motion has been far more successful in birds than in any other group and it's form has actually evolved independently several times since the dinosaurs. So, arguably, horizontal posture with femurs in an angle seem far more optimal, stable, energy efficient at passive balance, etc. Or, as a friend in biology used to say, “old birds don't fall when standing on the ground”, unlike old people who are at a higher risk of falling when muscle mass and coordination starts to wear off.

Since humans are minimal energy optimized, but birds have been found not to be while still being more optimal than humans at certain things. There should be a theoretical bird shaped bipedal model that is far more energy optimal than human proportions for biped locomotion.

https://pmc.ncbi.nlm.nih.gov/articles/PMC1571302/