my 4 day old chick has what appears to be a broken or sprained wing. It is always getting attacked and picked on my its mother hen, who does not like it as its not the same colour as her other chicks - even through she hatched all the eggs and they are all hers. I have seen her keep pecking it hard until it runs away and hides under the coop until its recovered, then it goes back for more. This afternoon I saw the mother hen had cornered the chick and was throwing it about by its wings! Now it is dragging one wing on the ground and the wing seems limp, but there are no bones showing, and I can't see any blood. It look the right shape, its just hanging down. I tried to foster it with another hen who has chicks, but the chick keeps going back to the abusive mother. I also tried to keep it separated in a box in my house, but the chicks goes crazy to get back to its family and won't settle away form them. It jumps up and down and stamps all over the injured wing trying to get out. I have put the hen and her other chicks in a large cage, and have left the black chick with the broken wing outside the cage where it can stay close to the mother hen, but not get attacked. I don't know what I will do this evening to keep the chick warm. Any ideas what I should do (if anything) to help the wing heal? And also, what I can do about taking care of the chick - I can't put it back in with the mother and its siblings.