My girlfriend asked me this question, as Rusty the BO rooster started crowing at 4:30 AM today... I really couldn't answer her question and when I started to think about it, it really doesn't make much sense. As chickens are so defenseless and the victims of so many predators, why would a rooster want to announce to the neighborhood..."Here we are, come and get us!!!" Especially considering that most roosters start crowing in the hours before dawn when predators are most active. It seems that from an evolutionary standpoint that a crowing rooster and his flock would be at risk. So, I wonder why the rooster really crows???