Poking around on the VN birds, I found these pics.
I can really see the wrinkled thicker skin on these boys.
Okay I found a site that gives all sorts of info on the birds, including different types, but I think it has a forum so might be rule violation to post address.
So I have learned there are different types, hennie and regular feathered, different sizes, spurred and non-spurred types, all sorts of stuff... cool breed.