OK. So I'm still not clear - is behavior at 3 weeks indicative of sex???? One of my English Orpingtons has recently started funny posturing. Gets low down, next stretched in front and snakes around. "She" tends to zoom around the brooder when she does it and it looks aggressive to the other chicks but they really just ignore her or get up tall and flap at her. Rooster?????? Feather sexed at three days to be a pullet but you know how that goes! LOL