My rabbit Cocoa, the more outgoing and exuberant of my pair, seems to enjoy eating my hair. He'll chew on it and pull it, especially if I have it braided. While it doesn't usually hurt, sometimes he pulls it out. I'm a little worried he might get some upset from eating bits of my hair, but I'm more just confused. It's not like grooming licks - he bites and tugs, but usually only if he can brace against my shoulder and push his face through the curtain it makes. Any explanations?