Jennie, from here on out, I would not communicate with him at all; ignore emails and if you answer the phone and it's him, I would tell him that you will not speak on the phone with him at all and hang up before he can answer. Print out a hard copy of your zoning laws and covenants related to keeping chickens and have them on hand. Talk to the police about the threats to your birds (to me, that is a threat to your kids as well) and make an official report about this. Anything could send rat poison into your yard, even if he only puts it around his fence, wind, rain, etc. This is more serious than just that he has wrong ideas about chickens.