Back in the spring I made a native bee nesting box by drilling a bunch of holes in the long end of a 4 by 6 inch piece of scrap wood. I cut one end of the 4 x 6 at an angle so that I could nail on a makeshift roof made from a piece of 2 x 6. I hung the nesting box on an east facing wall or our house with a picture hanger.
I used three sizes of holes to see which ones would be most popular: 1/4 inch, 3/16 inch and 1/8 inch. All were moved into by, I think, the same native bee within days of putting up the box. This afternoon, when I went to check on the nest to take some pictures for this blog post, I was delighted to see a lot of activity. There were bee butts sticking out of the holes, as well as bees flying in and out. I think they are some sort of mason bee--extra credit to the person who successfully identifies the species:
They move fast, so I was only able to get these two blurry shots. No, they are not Chupacabras.
With the success of this primitive native bee box, I decided to make more nesting boxes to see if I could attract other solitary, native bees. I put this one together with some small pieces of bamboo that I found in a neighbor's trash can:
I think there's a great potential to create works of public art that double as insect nests. For a nice example of this idea see the "insect hotel" designed by by Arup Associates.
For general guidelines on how to build nesting boxes see this guide from the Xerces Society.
We also have a project for a native bee box in our book Making It.
If you've built or seen a nice native bee box, leave a comment or a link.