At some point chicks seem to know who is a boy and who is a girl...at least the cockerels seem to like to play fight with each other. I was wondering if either an adult rooster or a slightly older cockerel could tell a pullet from a cockerel easier and at a younger age. Now, I really don't want to have a rooster killing a bunch of chicks, but would it work? Would a rooster only kill the male chicks? Would, say, a four week old cockerel be able to tell the cockerels from the pullets in week-old chicks? Has anyone already tried this experiment?