I placed robber screens on my hives last weekend. I now realize that they should have probably be on a while ago for the bees to get acclimated. Lesson learned. Yesterday seemed to be a very aggressive robbing day. I could hear the noise from across the yard. I've gone out and observed each morning to see how many bees are still outside. It's now down to mostly drones. I can watch them passing thru the top entrance, just curious why so many are not going in. They obviously fit thru. Isn't it a bit early for drones to be kicked out? Or is it due to a dearth and cooler weather we're experiencing this week?