Am I understanding correctly, people will put mothballs out to harm chickens or deter them from coming on their yard?
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I've never had any problems with my chickens flying over the fence. They are usually to busy. I didn't know that a chicken could dig such a deep hole trying to find a good bug or to take a dirt bath. They are so funny to watch.
We have 6' privacy fence in about the same amount of yard and have never had one of our girls even try to escape to the neighbors yard. That's not to say you won't have an issue with yours, but maybe you won't. We currently have 11 chickens in a decent sized yard. I will say it is really fun walking out in my backyard, the girls come running as soon as they hear the door open then proceed to follow me around the yard as I take care of things outside.