Are you sure the completed nest has no eggs?Chickadees will cover their eggs when leaving the nest.DON'T poke around the nest to check.I always use a 1 1/8" reducer on all my houses that Chickadees choose.I have never had any abandon the nest,But I always install it after I am sure eggs have been laid.If if were me I would keep a eye on them for a few days.When you are sure eggs have been layed ,install the reducer.As far as the nest that has just been started,If the blues do take it over,a least the Chickadees can still use the empty box you have.I have never used a reducer during nest building.

I would not put a suet block on top of a birdhouse, just draws in other birds which is one thing you do not want to do. If you know they will eat suet you could put it near where you see them perching alot but not on the nestbox. Not all blues will eat suet though especially if there are plenty of live bugs. Swaying in the wind won't keep them away from a nestbox, most nestboxes do sway some in the wind. Will be interesting to see which box they choose. Good luck! Donna

Thanks, Karen, for the excellent site. Wow! I had no idea that sparrows were so predatory! For now, we put a piece of duct tape over the hole. I noticed the sparrows hanging around and on top of it. Hopefully, they will go elsewhere. Is it actually possible to drive them from the property permanently? I'm wondering if the nesting box is even a good place for bluebirds. It's close to our house - will that deter them? There are shrubs around it which may attract the sparrows. I have a lot to learn about bluebirds and the SIALIS site is a good place to start.

Hi Pam and anyone else interested, After my last posting, we had a very high wind come up for about an hour. It blew some branches and clumps of leaves down all around our area, but no rain. It also blew down a large piece of wood that may have frightened the baby, but for whatever reason, the little bird went back under the fence to outside of our yard, and the parents seemed to keep him there this time. In fact, he quite moved on from being squenched up next to the fence, and I could not see him any more with a quick check, but I did hear him answering his mother, and the parents kept coming back and were in different trees to watch after him. They were actually in the trees they perched in to watch their original bluebird home, about 10 feet closer to the front of the house than they had been through this ordeal in our fenced back yard. This morning when I got up, the bluebird parents were not there nor was he. The parents did come back a couple of times when I was outside and did not seem distressed. They did not seem to be calling to him at all. I didn't hear them sing or call any at all. The trees they were sitting in as I mentioned before were closer to the front of my yard and I cannot see the birds from my back deck with binoculars like I could when they were looking after him in the shed. I didn't want to stay too close to see and frighten him into running again, so I missed seeing if they were going down and feeding him, if they had encouraged him to fly and if he did, or anything at all. All I know is that by about 10:00 a.m. when I went around to sit on my little concrete bench which is about 15 feet from the bluebird house, the mom and dad sat in the tree there where they always looked after their home like they were communing with me. Lol. I did hear what I know was some kind of baby bird high in the trees in my neighbor's yard right next to this area. Since I have not heard a baby bird calling from that area throughout this weekend, I'm just going to believe that it was him and that he was able to fly and get up there with his parents calling him at some time that I didn't see. He could almost fly the day before, so I'm hoping that they get him moved down the block to the little field where they moved and where his siblings are. I hope they bring all their babies back to see me some day the way another bluebird family did a couple of years ago. I'll try to let you know if I see all 5 of the babies some time, but there are lots of bluebirds around here, so it may be hard to tell. Last week, there was a whole family of about 7 bluebirds on my roof for about 30 minutes. Karen