I have 2 hens and a rooster all about 15 weeks old now (siblings). Yesterday the rooster chased a much larger full grown rooster out into the bushes and didn't come back until dusk. The hens were very distressed.today he has been crowing all morning and the hens are sticking very close to him. When he crows, one of them responds with a cute little cooing noise. What does this mean? Why is she doing it? How come only one of them is responding?