Please explain. Waist deep water is the one and only scenario that will compel an otherwise quadrupedal ape to move bipedally without the support of the upper limbs, for as long as the conditions prevail. It is 100% consistent with the fossil record. For example Lucy's Hadar was a wetland for 1Mys.
Oh, for heaven's sake.
Kevin Hunt's study of chimpanzees in Gombe found a level of "bipedalism" of 2-3%. 80% of those instances were in trees whilst >50% of their body wt was on hindlimbs. If he'd have studied bonobos in the Congo, wading would have dwarfed those figures. https://doi.org/10.1002/ajpa.1330870108
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Kevin Hunt's study of chimpanzees in Gombe found a level of "bipedalism" of 2-3%. 80% of those instances were in trees whilst >50% of their body wt was on hindlimbs. If he'd have studied bonobos in the Congo, wading would have dwarfed those figures. https://doi.org/10.1002/ajpa.1330870108