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I agree if you don’t have the will to eliminate sparrows then keep the box down. They will eventually kill babies or adults. Sad because the bluebirds need us and sparrows really need to be thought of as incredibly overpopulated and dangerous mice and rats with wings honestly. It is not an over exaggeration. Plugging my web page if this helps convince
Thanks. Pretty sure it was a sparrow. The gap is that big. And the sparrows had started a rat nest in each one…plus killed a swallw right across from it. I am kicking myself for not remembering to block the gap before trapping because it happened to me before and a sparrow escaped after tripping the van ert. Sorry about the ads I didn’t even realize that!! Good grief.
Anyways figured this site mught be helpful for your own education outreach and happy to take any suggestions.
so long story short I had a real bad sparrow infestation this spring that came on suddenly at the trail. Bluebird eggs were tossed and an adult swalow was killed all in 24 hours. Due to a terribly designed box (those cedar walmart ones are poor craftmanship lately) a gap allowed the sparrow to escape my van ert. This was after the first bluebird eviction and before the bluebird second nest was raided. I have since caught the sparrow (damage is done unfortunately)and it seems settled down now.
Here is the poster i plan to put in a few locations near the park linking to my site
My brother in Bucks PA must have had 4 from one pair in the backyard and at least 2 from a pair in the front yard. I think one of them even nested in a natural cavity.
Unfortunately I opened the box to find only one dead hatchling. Not sure what happened to the other two.

Maybe first try to establish them in a nearby park and the overflow may come. If you already have them around I would think a season or two. I am in a smaller lot suburb in Philly area and have been successful with tree swallows but never had bluebirds nest. I have had them come and go here in the off season and dearly spring and one year had a pair seemingly ready to nest but a neighborhood cat scared them away I think. I concentrate on keeping a friendly habitat and eliminating house sparrows. Those being around could also be a deterrent in a suburb.
I think i could hear them when I attached the guard and saw the mom a couple days later coming out.
Well whatever happened this nest didn’t work out. Haven’t looked in the box yet but i have been by several times with no adults in sight. Hopefully I didn’t scare them off with the predator guard but I did see the female going in and out after I installed it but that was over a week ago. Scared to open it. Man what a dud year. No luck.
So far so good. Mom has no problem with the guard in place.
Hope this is a helps. Couldn’t resist doing something to deter predators

Should I attach a wire mesh predator guard on the front?
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