Came across this scene yesterday. It was hard to figure out but I think I’ve got it. This was the spot where a Yellow Shafted Northern Flicker lost its life, most likely to a raptor of some sort, probably a hawk.
Judging from the scene it looks like the Flicker was being chased, it flew into this walkway, slammed into the fence, and was taken in the air just after that and carried away.
The circle of life is harsh.