When my 21 year old nephew was young, about 2yo, he used to like watching two large wood pigeons who visited the front lawn at the same time every weekday. He'd look out this medium sized window, about 1.5x2m.
Well this day I visited he was napping at that time and and I was in that room relaxing. I got a bit of a shock when I heard a sound that my first thought was a shotgun fired outside the house. So I took a look, nothing.
Then I saw something on the window, then it twigged what happened. There was a lkind of dust and oil shadow of a large pigeon, wings wide open with the full outline including beak and tall present!
After laughing and explaining to my sister i had a thought. I looked down below the window. Yep! There it was, dead. No idea if the window killed it but being skewered by a recently pruned rose stalk could have made sure of it. Which made us laugh even more!
Then the reality of me having to put it in the outside bin before my nephew saw it. From that day on they see a single wood pigeon on the lawn at the same time every day!