This is the forensic evidence of a collision between a bird and the window of our back door. I head a thump the other day when the bird hit the window, but when I got to the door, the bird was gone. Hopefully, it survived. I don't believe that I could draw an outline of a bird in flight as well as this. Behind the bird you can see the yellow bird feeder that it was flying from. The shape reminds me of the doves that are in abundance here. Maybe it was fleeing from a hawk.
Pictures I've taken of actual living birds can be seen in my Birds Album. www.flickr.com/photos/9422878@N08/sets/72157628206812625/