Have a building where birds are constantly flying into the windows.
At times even while we’re cleaning.
I have a client that likes to leave at least one of her “angels” on the glass. Mostly the bird just gets knocked out but some times they take the deep sleep. It’s job security for me!
One of my best customers. She’d call me after she had like a dozen bird marks. Some of them were really really detailed. Turns out that one of the predator birds in the area would chase doves and pigeons INTO her window to kill/stun them. And then the predator would just go down and get its lunch.