Blane Klemek: Several species of swallows thrive in Minnesota
Where have all the tree swallows gone this year?
That's the question I recently received from a couple of readers concerned about the absence of tree swallows using their backyard bird houses. Indeed, according to my friends, the tree swallows did not return to use the nest boxes after a 20-year run of annual use. Baffling, to say the least.
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