these girls will keep you guessing. the only thing I see for a reason for this happening is that last sunday I caught a swarm. I put the bees into 2 of those white cardboard nuc boxes. when I carried the boxes to my car I may have brushed up against my front bumper & left a pheromone scent. there were bees hanging onto the outside of the boxes who were released when I opened the trunk to get the boxes out. I put the swarm into a nuc & went about my day. BUT, ever since there have been around 50 bees hanging onto a small patch of my bumper.