What does it mean when a bird flew into my window and died?
At certain times of the day, light will refract on a window in such a manner as to reflect the sky and sometimes the trees outside, bird can be mislead by this image and thinking they are flying into the trees will instead hit a window. To reduce the chances of this happening again, see if you can obtain a Hawk silhouette to put on the widow, make sure it is made of a non reflective material and is on the outside of the window. This should stop future birds from making the same mistake.