Anyways, I heard that if you hold a chicken upside down when it's a little older that if it fights you its a rooster, and if it doesn't it's a hen. Is this true? I tried this on a few of my chickens and the ones who I think are roosters fought and the ones I think are hens did not... They are about 6 1/2 weeks old. Obviously I have found this to be true I think but just some other peoples thoughts on this would be nice? Thanks :]