Debate and discussion of any biological questions not pertaining to a particular topic.
because male's tended to hunt and gather food, the growth of facial hair could be in response to the associated dangers. thick facial hair act's as a second line of defence, it protects the skin underneath. children/females would not necessarily need this added protection, as they were predominantly cared for by the older (bearded) male's.
That is a very interesting theory, indeed, and certainly worth considering. I just have one doubt: should stroking that area under the lips actually make hair wear off? Wouldn't it be like a kind of massage, like they do with bald people, to stimulate hair growth?
”It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change.”
I'm skeptical that rubbing is the specific etiology, but the pattern is probably caused by sexual selection rather than other forms of fitness. If beards were practical for physical survival, women would probably have them too, so the whole pattern of facial hair growth in males is most likely sexual ornamentation. The little bald spots look much more sophisticated, in my humble opinion, than the even covering of fur under an orangutan's lower lip.
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