Back in the 60s, a bird hit my dad's church office window. He went out, found an unconscious but alive mockingbird on the ground. Since it was cold weather season, he put it in his office closet, and put his hat over it to keep it warm. He forgot about it and went home that evening. The next day, the church secretary heard this noise coming from his office and opened the closet door. The bird, probably now starving, panicked and started flying between the two rooms (scaring the secretary of course). They opened all the windows in the two offices and it took 30 minutes for the bird to find the exit.