This is a neat question and idea. I HAVE NO IDEA as the first thing that popped into my head was a laughable:
I then look up the scientific term for a “muscle beard” and finding it out to be called a " byssus"
and then found this as a fascinating thing to learn about today:
https://www.nature.com/articles/s41598-020-79253-7
Learning for the sake of learning is fun 
, I hope you find your answer!