I have seen bee's swarm like this before but usually they are passing through and the queen is under that pile and they don't stay that long but these guys are feeding they emptied this jar in two days and when it was gone so was they. Only to return when the jar was refilled. Its bad because the hummers won't feed there due to the bee's I have tried something new today I put pam spray around it before I closed it on the jar it works to keep the ants away I will see if it sends the bee's on there way