Vulture hocks are a cluster of thick feathers (not soft, down like) that protrude backwards from the thigh/hock of the chicken. They are desirable in some breeds, but they are a disqualifier for Brahmas. They are desirable in Sultans, so if you google the breed for pictures you will find some great examples. Usually they aren't as well defined in Brahmas, but you'll get the idea. I think it's a little harder to see them in pictures of adult Brahmas, Brahmas aren't as streamlined as Sultans. If you look at the pictures that I posted of the 3 1/2 week old darks, you will see definite feathers coming in that are longer and are protruding backwards instead of wrapping around the thigh. It isn't usually a problem with LF (large fowl) Brahmas, mostly a problem with bantams.
Wee little vulture hocks