I think they can pipe in the cell. Not sure on the colony actually killing other queens. Maybe they died and they are just terring the cells down.
www.youtube.com "queen piping"I even have a microphone installed in one of my hives, and plan to do it with all of them, but just for learning purposes and not because I know what to do with it yet.
Right now I wouldn't know a piping queen if she played me "Amazing Grace." Can anyone recommend some online recordings or videos that give an idea of what to listen for?
This would have been handy last weekend when we were deciding that a hive that attempted to raise a queen had failed at doing so. We never saw a new queen or any signs at all of brood, but it is possible we jumped the gun and a shy virgin was in there. Piping might have revealed her.