Up to now i have had 3 hens(adults) and all are doing great! a couple of days ago i bought two ten week old chicks and a 6 week old duck whom are getting on brilliantly! But when i brought these home problems began! I put the 3 new birds into the coop during the night to cause as little hassle , this went all fine and there was no hassle in the coop!! the next morning when i let them out everything seemed fine! but after a while one of the older birds started attacking the young chickens (not the duck) for the last 4 days she has be attacking and harassing the young birds! i took the bird causing hassle on many times now but he still is attacking the young birds and not letting them eat,drink or rest!! the 2 older birds seem to have no problem wit the new birds!! I have very limited space and must house them together and in the same run!! i am very worried for the the young birds and don't know what to do!! I need HELP badly!!