please separate the ill chick from the others, they will end up pecking her to death. If she does have a disease she could have passed it to your others. Did her legs have the bluish/purple marks before your chicks began pecking her? I'm wondering if she has circulation problems - with her legs. Please post on the Emergencies, thread now, and subscribe so you know as soon as someone answers. If you could post clear photos of her that would help greatly. I wonder if someone at the school abused her and maybe the girl rescued it and brought it to you.