We have a pair of barn swallows that nested inside the kennel building (I am not sure how they go about getting in and out through the dog run doors without any of the dogs ever catching them) for the past four years. I am assuming it is the same pair returning every year because I find it hard to believe that a random pair of swallows would learn to enter and exit the building every spring.
So I think your chances are pretty good they will return.
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