I have a guinea (I think a hen) that was setting on eggs in a nest outdoors. I think a skunk came and ate her eggs. Since that time I have noticed that she has a bare spot on her back. The feathers are gone in about a three inch circle. I don't know how to tell if this guinea has a disease? This happened about 2 wks. ago and I can't tell that feathers are growing back in yet. Also, I notice the other guineas in my flock all peck on themselves some. Is that natural or would that mean they have lice or something? My guineas are not tame where I can hold them and doctor a sore. If I have a problem, how do I treat a bird that would be difficult to contain? I don't know how to tell if my flock of 15 have parasites of some kind? My birds free range, and as far as I have known before have been very healthy. I feed them some cracked corn on the ground in their pen at night, and I give them some 22% protein crumble chick starter. Since they free range on our farm they have access to all the insects.