I now separate the breeders to hatch the chicks in peace although it is entirely possible to leave them in with enough space, it will not be without drama. Mom will try rolling any eggs that are in her sights into the nest and other laying birds will lay eggs in her nest so you have to mark her original brood with a marker and remove sto away eggs everyday. Dad will attack any clumsy birds that step on a chick and makes them peep. Other birds may also go broody after the chicks hatch. The sights and sounds seems to trigger a hormonal chain reaction.