I have 4 week old chicks, 12 RIR's and 12 Silver Laced Wyandottes. I noticed yesterday that about 5 of the Wyandottes had bald spots on their backs where there had been feathers. I then saw a RIR pecking at the area on one of the chicks, so I seperated the chicks which were being pecked from the others. someone told me they will eventually bleed and will die. Please help with what I should do!! Are RIR's aggressive??