Oh they can CROW! We hatched some early Dec. We also had adults (2 males with 11 females in 2 cages). They were all in our garage, which has a window for natural light, and we leave the overhead light on during the day until around 9pm. The male "babies" started to crow around 4 weeks, and were crowning in earnest by 6 weeks. So.Much.Crowing!! Most of the boys and a few girls of the hatched baby batch were culled for meat a couple of weeks ago (around 9 weeks of age). We should have culled around 7 -7.5 weeks - the boys were fighting a lot despite being in a big/roomy cage with no females with them and we had a rotating assortment moving through the "infirmary" cage some with pretty major head and neck wounds (all which healed very well and quickly). Anyway, as I sit and type this, several rooms away from my interior metal/insulated garage door (which is closed, and the birds are at the far end of the garage - the farthest from the interior door), I am hearing the occasional "crow" they are not perhaps as quiet as some might think. Also, the girls will sing an "egg song" when they lay - it is not as loud as the males crowing, and it kind of sounds like they were/are in pain...but voila! a warm egg is present in the cage!