I can been by a trailer park twice now to get swarms of bees. These turned out to be clusters of about a cup or two of bees, no queen and they seem to be very quick to move inside the RVs (within an hour or two). Then they spread out across the windows and die (or get vacuumed up). This last group was dying within an hour or so, but were not sprayed by the RV owner (she wants me to save the bees. They had this issue last year multiple times in the small place.
Why would small clusters like this appear and die? What causes them to leave the hive or have them been left behind?
Started 9/13, building slowly, not trying the no treatment anymore