To relieve my own boredom right now, being stuck inside during a cold snap, I'm designing a novelty for the run. It's a branch about a foot from the ground that swings on an axle like a teeter-totter. I'm working on making the weighted end injury proof. But let's go to the other end for a moment. A treat of any kind is suspended at chicken head height at the end of the branch. The branch is weighted so that one chicken can be on that end without it teetering. When a second bird comes along the balance is upset and they both ride the tilting branch to the ground. I'm concerned about a third bird getting under the weight at the other end and being bonked. At least it's fun to think about it and try to improve on the engineering. Any ideas?