I have 7 hens and 1 rooster (pullets and cockerel would be the correct terms, I suppose). They are about 15 weeks old. Today I noticed that the rooster will, without provocation, violently peck the hens on the backs of their necks. He seems to do this to whichever one is in his vicinity when he's feeling "peckish." Is this normal behavior? I see a lot of posts on here about hen-pecked roosters, but I'm having trouble finding info about the opposite situation. I just don't want him to hurt any of the girls. He was actually supposed to be a girl himself, but I guess whoever did the sexing on that run of chicks missed him!