Vultures?  My experience with vultures (we mostly call them buzzards around here) is that they don't have a lot on their minds but eating, but I suppose they might see such a thing.  If they do, I bet they don't even notice it as anything out of the ordinary.

Also, they tend to go for things that have been dead a while, if that makes a difference.

I had one fly in front of the truck once, a few years back.  I scared the poo out of it.  Vulture poo is not a pleasant thing to have to clean off a windsheild.