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I have roosters and so far all of mine have been fertile little eggs. I keep it cool inside so I'm not worried about babies forming once their inside. Mine are still learning how to do things too. I've got one hen who 'announces' laying an egg at random, she's never on a nest when doing it and another hen hadn't just plopped one out. She's silly.

Mine often do the egg song when there's no egg present! Hahaha. I have roosters too.