TBeek, I don't know for sure. All I know is it was very noisy, and the piles of bees were live, fighting bees. As were the bunch of bees next to the left of the opening piled up at the bricks. I went back out last night right before dark, and it was calmed down a lot, with a lot less bees, but a pile of dead ones. I'm going out this morning to examine the dead bees and see if they're drones. But when I was watching them yesterday, I didn't see drones. And all that fighting was going on where I had the feeder propped up.