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Three or four months I seem to recall, as others have said, their voices change. But it's kind of a gradual change, and some change earlier than others. Roosters make all the same calls the hens make, and a mature rooster who takes charge of a flock of hens has other noises he makes as the leader of the flock (aside from the crowing, of course). Ours will make a quick little "alert cluck" sound to tell the hens when something unusual but not necessarily threatening appears, like a person or a large animal, or whatever. Then there is his "here's the food" call, which is an excited little gurgle of low-pitched clucks, that he uses to show the hens something edible he has found. They all sound similar to the uninitiated but they mean quite different things, and the hens respond accordingly. It's quite amazing actually the amount and complexity of the verbal and body language communication that goes on with the roosters.