Just to add: My current roo will crow when he hears unfamiliar voices. He is completely quiet when it’s just me coming out to lock up the coop after dark, but when I bring someone else along (which I don’t often do) and they say anything, he will start crowing. I talk to them while I lock up (close pop door, close coop window shutters, lock run door and coop door), so it’s not the commotion or my voice that sets him off, but as soon as someone with me says a word, the roo listens up and starts commenting... That said, he is so much better than our neighbor’s yappy dogs who will bark at the same, should be familiar by now-things daily and for years...