I had a rat problem for almost 1 year now... When the rats first came it was really bad they loved eating meat, they killed some few month old chicks and really killed almost all my dads doves that he has cages on the ceiling of the coops (rats would rip there heads off). I put some rat poison pellets in the boxes and it worked great until they came back again... The new rats aren't as meat eating as the rats in the past but they did kill like 2 of my dads doves. They don't bother chickens 4+ months old but my biggest fear is I am getting chicks in about 3 weeks from now and they are very expansive cause they are coming from a good breeder.. Of course I am going have them in a brooder in the house at first but once they grow there feathers they need to go outside... I have used the poison boxes but they are not eating it! I even tried to put some peanut butter and rolled it up with poison pellets for a more stronger smell but still nothing... I put the boxes in the coop run at night and take the boxes away in the morning when I let the chickens free (I don't want the chickens sticking there heads in thinking it's layer pellets, lol). I tired putting the boxes behind the coops but either raccoons or opossums are eating it cause I find the box flipped over about 5 feet away where I put it and I am wasting poison.