They don't get discarded or thrown away. They are recycled into bird houses and feeders.
This was taken at my parents home this past Thanksgiving when we were visiting. I liked how the boot looked against the OOF background and the combination of "old" spiders webs clinging to the boot. Unfortunately, there was no sign of a bird at the boot/feeder/house. And I don't think there has been one there for awhile lol
D300S 24-70mm @ 50mm ISO 800 1/1600s f/2-8 hand held