This shadowy image is what was left on my window after an unknown bird hit a window while fleeing a hawk. I saw the hawk leave the area after I heard the strike, but this time, the intended prey escaped his attack.
Mourning Doves often leave very powdery marks on a window they come in contact with, and the size was about right for a dove. I was fascinated how the body, face, left eye, and left wing are all clearly evident.
Unfortunately, even when birds fly off from a window strike, they sometimes die from the internal injuries they sustained.