We have 7 baby BA's that we just bought a Chicken Coop for from CL. The coop came with a flock of hens. There are about 3 or 4 of the 12 who are missing feathers down to the skin around their tales, back and top of their wings. In letting them out of the coop once it was in place, I noticed a few who are fully feathered picking on the ones who are missing feathers. Are the missing feathers a sign of disease, stress or were they just bullied from being too cramped in coop that should have had half the number of the flock in there!? The guy delivered it to us, so we did not know the condition of the birds until they arrived. We already had plans of getting a new home for them, as they would naturally bully the babies when they are old enough to go into the coop. Should we worry of contamination and bleach everything? Get rid of the birds, treat them? Is there something to treat in the first place or were they just stressed and picked on? Thanks for your advice!