I had four birds separated from the rest of my girls because I got them from a different place than the rest of my chickens.Well the one of them that looks like a rooster is now about 13 weeks old if the initial age I was told is correct. While he was seperated I heard him try to crow one morning. After about a month of isolation I added him and the others in with my other pullets, thats been about 3 weeks now and I have not heard him try to crow anymore. The others are a bit larger than him and have not totally become accustomed to him. maybe he's not at home enough yet to crow what do my fellow chicken enthusiasts out there think?