A while back there was a thread on bees drilling holes in cob walls. At my house they come in spring and leave by mid summer or earlier. They look like carpenter bees but seem to like the clay sand mixure. Anyway I finnally got around to taking some photos. http://www.gypsyfarm.com/Yapig/view.php?gid=4 The bees are gone of course by this time of the year. Pat www.gypsyfarm.com