Here is an observation I had.
How often do you see dead birds. I often see dead squirrels, cats, deer, possums etc. but never birds.
I have a long route that I walk a few days a week. Most suburban, single family homes.
I see the dead critters in the streets. I see an occasional deer that doesn’t make it over the spiked fence. I see dead birds as often as the others. Just on lawns or in the gutter of the street.
They get eaten by other critters pretty quickly. Everyone likes chicken.