We have 7 purebred Australorp chickens, all 5 months old. We know we have one rooster for sure, but one of the hens is starting to look and act like a rooster. "She" crows (not very well), her comb is bigger than the other hens, but not as big as the roosters, and she is built really odd like, almost in between a hen and a rooster. This chicken has got us really confused, please help!