Wow, that doesn't look to good but at least it didn't dent the car or leave any other lasting impressions. I've been in the car a couple of times when all of a sudden, I hear a thump only to find a large splatter mark on my car when there are no objects or people around me for at least 100 feet.
Bird poop can be any colour. I've seen all colours and consistancies. That reminds me, on our honeymoon, my wife and I were posing for a picture while a hungry seagull swallowed our 8 inch pizza in one gulp. I wonder what colour that poop turned out to be?