I have four hens that I raised from chicks(about 6 months old), I was given three more hens yesterday(about a year old). They seem to be getting along alright, but the three new chick were not very well taken care of and I'm a little worried they will give my hens something. So here are my questions: 1. One of the new hens is missing some feathers on her wings and the other hens are "eating" her in that area? is that normal? what should I do? 2. Several of the hens have a few small black spots on there combs, what is that? 3. One of my hens is shaking her head a lot, is this a sign of something bad? 4. Some of the hens scratch there beaks side to side on the ground, what does this mean? 5. If any of my hens are sick or get sick, is it still okay to eat the eggs? Any help would be greatly appreciated.... I never thought I would stress this much about chickens, but somehow they won me over. Thanks in advance.