A mason bee that reused an old carpenter bee hole for her eggs. This hole has been worked for over a week solid, I can't imagine how many cocoons are in there? hehe awesome She looked like she was stuck here.. I am guessing laying the last egg. I will see if its all capped like the one to the right. See other pic.
The two holes that were reused and you can see my Mason bee house in the background I built it and put it up after I saw these 2 holes getting all the activity.