"The mane is thought to keep the neck warm, and possibly to help water run off the neck if the animal cannot obtain shelter from the rain. It also provides some fly protection to the front of the horse, although the tail is usually the first defense against flies."I'm not buying it. I find it implausible that manes would evolve because horses with manes had warmer necks, and that their warmer necks proved to be significant to their reproductive success. There must be some other reason manes evolved.
But what would that be?
I was thinking sexual selection. That is, I was thinking manes are like the male peacock's tail. It provides no survival advantage, but the female peacock's like it. So the females pick the males with the best tails to mate with. That's what I was thinking.
But then I remembered that both male and female horses have manes. So now I'm thinking sexual selection probably isn't the reason horses evolved manes.
But what is the reason?