I had sparrows and mice eating most of my chicken feed. I agree with the others that having a repeating mouse trap is essential. ChickensAreSweet recommended to me an awesome trap (Ketch-all) that is even made in US (IA)! It works fantastically well. Thanks CAS! I also made a treadle feeder. You can find plans to make one rather inexpensively here: https://www.backyardchickens.com/web/viewblog.php?id=56638-building-a-treadle-feeder