I agree that chickens don't actually change sex. I meant that as in: was it possible to have had a damaged/injured ovary at only 9 months old, and that might cause the larger comb/wattles and the crowing to start. However, after reading up on bantams and cochins and hens that go through that process, since my original post yesterday, I'm very convinced that we just have a very low on the totem pole, slow to develop rooster. Just not sure what I'm going to do with two roosters now... I don't want them to start fighting like Dick did with Harry before we sent Harry to freezer camp.chickens don't change sex, but hens can crow or grow male features like hackle and saddle feathers and spurs. Hens that do ALL these changes tend to stop laying eggs, but can not fertilize other hens as a true rooster can do. I have a few hens that have spurs, but they still lays eggs. I think Boots is just a late bloomer as this tends to happen sometimes when there are other more mature roosters around. Now if you look on here you will see hermaphrodite chickens that have both sex organs. These chickens tend to look like one chicken on one side and a whole different chicken on the other side, very neat birds!