A pigeon got into the stockroom where I work once. At the front and up high are large windows looking out into the main center area of the building, which is quite huge.
The bird flew INTO one of the windows, not once, but twice, head-on. The building is quite dusty, so we had two very distinct & perfectly shaped pigeon shaped silhouettes on that window for a good couple years.
We also had a young blue heron in that main area. He flew in one of the open dock doors at the end. Took most of the day before he finally figured out how to get back out.
He was lucky since he came very close to any one of four 15' (Big Ass) ceiling fans while flying around in there.
Birds are stupid.