Why is it that every broody hen I've ever had seems to come of the nest to eat/drink/poop breathing fire? I mean they come out ENRAGED at something! Their feathers are disheveled, they have a murderous glint in their eyes, and they peck any chicken stupid enough to approach them. The nest boxes are in a clean, well ventilated, and quiet area. Two of the hens have successfully hatched out chicks. Why are they so angry?