I think, Jacob, that the idea is to get folk to shoot the targets, and many with older eyes would be excluded without some highlighting feature.
Me, I shot my last one with no markers or other aids, but if folks cant see the target they aren't going to shoot it.
I did try with a black square of tar paper stapled over the bulls, but shot just as well without them.
I guessed the crow though, head, and straight up from leg for body!
He seems as smart as a real crow for avoiding getting shot!