not found on most animals, if it is allowed to grow free it can be quite thick and long, gets in the mouth and nostrils.
What purpose did it serve when we had no tools to trim it?
In: Biology
Aesthetics. They’re our equivalent to peacock feathers or a lion’s mane, which is to say that they serve no purpose except to advertise reproductive fitness. The beard, at least, serves as the slightest bit of protection from the elements and from a rival punching you in the face, and it’s likely that the mustache just grows along with it because our DNA sloppy like that. Still, a mustache serves as an advertisement of sorts, saying “I am a virile man and I can give you healthy babies,” which is a good thing according to evolution. Since its so tied to the hormones of puberty, boys, as well as men with certain hormonal/reproductive problems, can’t grow facial hair at all.
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