Mason Bees will nest in the strangest of places. Remember my blog on nests found in a folded umbrella? This is a similar situation. The nest was placed inside a wooden bee home. Bees proceeded to fill the nesting tunnels. When all nesting tunnels were filled the bees found nesting space behind the nesting block. This space was perfect. The cocoons fell out of the cavities when we removed the block from the wooden bee home. In other words, bees will find nesting space in the most unlikely spaces. Their drive is to survive and produce offspring no matter what kind of nesting space they may find.