My sisters each got o Rhode island Red and i put them in the coop w/ my chicken, and they r around the same age, but she started attacking them, she had eggs that she had been sitting on, but after that i threw them out, they were there 2 long any way. But now they r bettr situated, She will still peck them, but i think that its the pecking order or hiererchy.But i realized that 1 of the Reds had a lil bit of blood on its comb, and wen it goes inside the nesting spot the othr Red goes in there and pecks her head wen she lays down 2 lay?