This year will make the 5th year that this box has been up. Each year the Bluebirds will have at least three groups of five babies. That's 15 new little Bluebirds each year. If everything goes well that will make 75 birds that hatched out of this one box since I put it up 5 years ago. If you have a place to put up a box you'll be glad you did. They are beautiful and fun to watch.
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From @cullyguy