A bird just flew into my window!

I'm sitting here at the computer this morning when suddenly there was a crash against the picture window that looks out into the backyard. I looked up just in time to see a biggish black bird fluttering away. I didn't think that window was that clean! Well, it's certainly not anymore, now it has a smear of bird saliva drying on it. (blech)

There was a whole flock of cranky black birds flying around back there and oh, my, are they ever noisily upset about their bumped buddy!