Neal, please forgive, but the tiny little flying UFOS in the video of yours by size do not look like hornets, but wasps, and quite common ordinary wasps. Or is the perspective fooling me? Do i miss something there or is this an especially aggressive problematic American species? A Republican wasp, maybe?
If it is just a common wasp, why all the hassle about them, I dont get it?! We have a garden over here, too, I have wasps visiting my loggia every day, sometimes even in the appartement, and every couple of weeks, especially early in the year, a hornet flies by as well and checks for an inviting cave to settle in.