Our chickens roam the yard when we're home, and normally don't get into any trouble. Today I did some spring planting. I put up a 4 foot fence around the garden, and 2 of them managed to fly over it and destroyed my plants. I was not happy, since I've been raising these plants in the greenhouse and they were beautiful. HOW can I keep them from flying over the fence into the garden? I may have to let them out of the yard under strict supervision from now on. Any ideas? Thanks.