Yes, agreed. The point I’m making is that bipedalism in flightless birds, such as ostriches and emus, is very impressive and involves just as many computations, allowances for gravity, intricacies of proprioception, etc., etc (and I enjoyed how you spelled all this out, because it is amazing) as bipedal human beings. Since an ostrich can do this with such a small brain (physically speaking), it seems to me unfair to correlate human beings’ greater intelligence (including math and verbal intelligence) with bipedalism per se. Though it is possible, I guess, that bipedalism allowed us to use our hands (which ostriches clearly don’t have) and that using our hands to manipulate objects might have helped in the development of intelligence?