Another strange thing... Of course my bottom entrances have been reduced all winter, with nearly no activity observed there. Day before yesterday I opened up the reducers and dragged out all the winter-kill. So, the bottoms are totally clear now, with reducers put back in place. But, the top entrances are jammed like a Walmart selling toilet paper, and the bottom entrances look like the gates at an airport. Do I need to "retrain" them somehow to use the bottom entrances again?