Well I'm not sure it's an invention but I made a dust bath/play area for the chickens to keep them from messing up the vegetable garden. They love it, they spend like 1/2 the day in that corner now. I filled the brick area with dirt, sand, potting soil and a little DE. The tree is a dead fruit tree that was sitting in the side yard waiting to go out with bulk trash but I kept finding the chickens on it. I know people will sometimes hang heads of cabbage from the top of their run or coop so I plan to do things like that with the tree. I'll tie cabbage or corn cobs from the top branch to make treat time a little more interesting.
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Looks great very good job.