Tammy --- It's all about keeping your chickens happy where they're at, in which case a three-foot-high fence is enough of a deterrent to keep them inside. There's also the flock mentality going on --- they all want to be together, and there's no way one chicken can talk all the others into flying over the fence, so unless everyone gets the idea at the same time, it usually doesn't happen. Our chickens can fly over a five foot high fence, but do they want to?
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