I had a couple wasp combs in my frame greenhouse, and one in my mower shed. I am in and out of both of these sheds and these bees (or wasps if properly named, and they don't fall into the "bee" catagory) never bother me as long as I don't bother them or their comb nest. But I noticed yesterday that they were all gone. I'd never paid any attention before. Once they've finished nesting and all hatched out, do they remain in cold freeze zones and hybrinate someplace, or are they like some birds and fly south?
