After a week or two of seeing a tree swallow popping its head out of the nestbox, I had yet to observe any signs of a nest being built inside. The other day, they were agitated at my walking past the nestbox. Today, I spotted them perched on an electrical wire. After snapping a few pictures, coming inside, and uploading them to the computer, I noticed there was a piece of dried grass in one's beak. Looks like they are building a nest and are here to stay. :)
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