Just because it's called a silverback, doesn't mean you have to see his back!  The best solution would to rename it, describe it as the type of gorilla it is, rather than just as a silverback, since all male gorillas become silverbacks.  As far as the pictures go, don't bother trying to get rid of any, that would be a waste of time because there has been an on-going war for a while now over that and other things, and it keeps getting changed back.  I think the article could do with less pictures, but that's not going to happen.