What Giant Flying Pterodactyl Pooped On My Car?

I remember dealing with this last year.  It seems the second we warm up after snow and colder temps, flying dinosaurs or airborne caribou take to pooping on my car.  You too? 

The strange thing last year was, as I compared notes with friends, it seemed those of us with gray cars seemed to get targeted more often than friends with other colors.

I get it, we live in an area with plenty of ducks and geese, but what in the world causes them to dive bomb and cover my car?  What causes it to be emerald green?  What makes a gray car the most appealing place to "empty the tank?"

Am I the only one dealing with this, or have you faced the same problem?  If you're in a gray car, do you feel like it get hit more often too?