I don't think it matters on the color. One day I had let my birds out and one followed me into our blueberry patch. It took me by surprise. A hawk appeared like out of nowhere and killed my Rhode Island White right in front of me. It happened so fast I didn't have time to react. It didn't take her but did kill her.All the chickens I lost to hawks were brown. A hawk did try to take one of my Black Star hens, but didn't succeed. I'd like to think the black ones are safer, but I don't trust hawks. (Also, these attacks all happened in the winter.)