I'm at a loss of how to handle my chickens new aggressive behavior. In the spring I got my first flock of chickens at one time. 6 Buffs, 1 Barred Rock, 3 Araucanas and 3 Wyandottes, all girls. They were all the same day old chicks and got along just swimmingly until this week. I noticed the backs of all 3 Wyandottes feathers were strangely missing the normal puff of feathers. The next day I went out to feed the girls and I caught a sight of flesh on one of their backs. At closer inspection all of the Wyandottes have at least a 1 1/2" patch of missing feathers right at the tail. I immediately moved them into the garage in their old brooder box. During the day I've let them free range in the yard with the other girls. I really would like to try to keep them together. The guys at the Agway in town said to try mixing blue food coloring with petroleum jelly and putting that on the wound. Something about the color keeps the other birds away. I also read that talcum powder is a deterrent. I tried both and kept them together in their yard. This evening I couldn't tell if one looked worse or not so just to be safe I moved them back to the brooder box. I don't think it's overcrowding, they have tons of space. When I checked on the Wyandottes this morning one of the girls back's is still very reddish looking. I really don't have the facilities to keep a flock of birds plus three separated individually. Any suggestions would be greatly appreciated.