I stumbled upon this site, and the front page had this little story on it.
BIRD

Not really an angel, but you got to admit it's just as cool.

Aw, that is rather sad. I hope the bird is okay. It must have been a very dusty bird...

so a bird smacked into the car? it probably died. that's really cool

Oh lighten up P, it's more than likely a drawing on the window, no blood is a big give away dude?

I don't think it's a drawing (link) - we had the same thing with our sliding glass doors at the back of our house about a month ago. The bird, a pigeon, died in that case and was found only a few feet away with no blood spilt. According to the site I linked, through, the bird in those pictures had a two in three chance of surviving.

EDIT: For clarity

Good link, RT.

It's definitely the outline of a bird, made by it's feather dust. It's still so sad to me, you can see where it's beak hit. Poor baby.

thats awesome, i saw something almost identical in the snow once, no track marks around it or anything, just the outline of a bird crashing into the fresh powder. it was so pretty

What goes around comes around, lol.