https://groups.io/g/AAT/message/72915
Piggyback orang, baby clings to neck fur; humans and orangs have same (afferent) hair line, unlike African apes. In humans the (occipital) hairline matches the trapezius muscle position, unlike Africa apes which extend to the skull crest.
https://groups.io/g/AAT/message/72909
Photos of chimp gorilla orang human mother & baby piggyback riding. Human photo replaced with modern mother *holding baby in arms*, implying lack of continuity; archaic Homo mother and baby piggybacked. All ape mothers hold their babies in their arms at
times!
I haven't seen a gibbon piggyback riding, they are seldom terrestrial and never aquarboreal/aquatic.
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