I think they have scouts looking around when the bee population gets large, then they find a place- like a hollow log, or the hollow space in someone’s ceiling, or, in this case, someone’s floor. They will swarm and half will go to the new nest with a new queen, and half will stay with the old one. But that’s only the case for some bees, bumblebees have nests in the ground and most species of bees are solitary, so they’ll drill holes in wood, dig holes in the dirt, or live in hollow plant stems.
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