I've always had a lot of small yellow and black striped ground hornets arround my place. I haven't paid them any mind because they are the leat aggessive hornets I've ever seen. I can stomp on a huge hole of them, run them over with the lawnmower and otherwise taunt them.....they don't bother me at all.
But, this morning, there were a dozen or so wraping up bee corpses below one of my hives. A couple were even harrassing the guard bees. They are probably just desperate for protein, in a last ditch effort to reproduce before the cold sets in, but should I worry about them? Will they attack enmass?