Would it be possible for a rooster to never crow until 28 weeks of age? I have three chickens that I thought were hens. They all look the same -- same size, feathers, behavior. No big tail feathers, no huge combs or wattles. The other day at dawn, 2 of them started a garbled, choked crowing-type sound. Can be faintly heard through closed windows. Not nearly as loud as a full-on rooster crow. Lasted about 5 minutes, off and on. Is that a hen noise or are these certainly a rooster?