My best guess is song sparrow. The bird was inaccessible for a better look. Sw facing side of glass, about 2 feet away from wall and about 10 feet below window. There was a bird skeleton to the left of the sparrow as well.
Window strike, collected for ANS. Sorry for gross photo
CO Boulder Co Lake Park Louisville
Lighting was really bad, but when the bird flew away it had an orange face and long legs
Window strike on new apartment complex. 1 ft from building. Stiff.
Window strike, dead upon arrival