I came across something new while monitoring this year. One of the boxes had a bluebird nest and 3 eggs two weeks ago. When I monitored last week, there was moss on top of the bluebird nest. I assumed that a Chickadee was building its nest on top of the bluebird nest and eggs. (That is a problem with House Wrens, but I have never seen Chickadees do it.) I asked some other nest box monitors and it was something new for them also. I left everything intact to see what would happen. This week, the bluebird eggs had been broken, some hair had been added to the Chickadee part of the nest, but there were no Chickadee eggs. Again, I left things as they were. Stay tuned; I will let you know what happens next week.