So my suggestion and this is only a suggestion, the beards which in the past have been interpreted as a kind of erm epigrammatic signal, in other words a kind of erm sign on the face of the male as they're deceived , my guess is that,th that beards may actually have evolved to protect the throat because erm the critical thing in, in killing somebody is to block the, the windpipe and that's  and in fact even, even lions do this, you saw in the film when a lion kills an antelope or something, he doesn't go to all the trouble of making horrible gashes, he grabs the, the windpipe and holds on until the antelope or whatever it is is just er