Hello, I saw something online about Silkies being the only breed that is hatched with an opening in the top of their skull. It had photos of the actual skull showing how it was formed. Part of the brain is exposed and the comb is usually located over this area. The area is vulnerable to injury from other chickens if attacked on the head. It said this usually results in paralysis of some sort, usually a twisted neck. Has anyone ever heard of this or can you verify it? Thanks!