Five little mason bees left a unit today. Unfortunately I was out to lunch so missed the first four. I was lucky enough to get two photographs. Look at the one with the tubes and you can see the bee carrying out a piece of soil. They will take out every piece of soil and clean the tube thoroughly and more than likely reuse the same tube. Anyway he finished his chores and took himself of to catch some sunshine. By the way mason bees are only half an inch long. The males come out first, and jostle for the best position. They will have to wait several days before the females come out. I am hoping in the next few days that I will see lots of bees coming out and will have a lot of photos to upload.