Bye-Bye Baby Bees

The babies in my bee condo have flown the coop. I noticed the mud plugs that have been in place since August are broken open now and the tubes of the condo appear empty. If the bees hatched, they are entering a cold world. The other alternative is not so great either: Maybe a predator ate the bees. I don’t know, but am looking forward to continuing to observe the bee condo over the next few years. If anyone knows much about leaf-cutting bees, please comment on what may have happened.