At around Five weeks, all your roos will start to crow.... Coturnix roos will crow in the dark! They will drive you nuts crow'n. When this starts, drag up a chair and watch. Spot the ones that crow and give them a zip tie bracelet.... hens dont crow. I would rather watch birds and drink a cold beverage, waiting to see who crows. Hate look'n up a birds skirt or squeeze'n toilet parts!!