DH is allergic to bees. There have been bees buzzing around him as he worked on the greenhouse windows. He kept hoping they'd sleep sometime like very early in the morning. Alas, no such luck.
DH finally called pest control yesterday and they came today. The man was here for 45 minutes. He was able to do most of the work from inside the shed. There is a shelf on top of the wall under the roof - triangle in the second picture. He unscrewed the shelf and there were the little critters. He sprayed the daylights out of them both inside the shed and outside the shed. Cleaned up the nest, bagged the stuff (took it away) and put the shelf back.
The left nest is 4". The right nest is 6". The critters were yellow jackets! *shudder*