This pair of Tree Swallows seem to be moving into the latest birdhouse I built. I just put it in the yard about two weeks ago and have been waiting to see what would move in. Tree Swallows are one of my favorites.
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I design my birdhouses so they open for cleaning. In some cases, they need to be cleaned, or wasp nests need to be removed, before birds will move back in.
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I usually drill drainage holes in the bottom, but I forgot this time. Guess I'll wait until Fall to do it now.