i have 2 hens that have been broody for almost 2 months. i gave them eggs to hatch but they killed the babies. now they are sitting on nothing but won't stop brooding. i make them go out in the yard at least once a day but they are very thin and i'm worried about them. they are family to us. plus the one hen that isn't broody has taken to laying eggs in the yard since she can't always get an open nest box. any suggestions? i've read about using a wire cage but that really wouldn't be possible.