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I checked all of the boxes last month to make sure they were empty and clean, and ready for this year's season. We always see lots of bluebirds in the meadows, so we know we have a flourishing population. And, I'm always glad to see the male or female perched on top of the box, checking out the scene, perhaps.
Coming back from lunch today, I was delighted to see a pair of bluebirds investigating a box that hadn't been used last year, except for a paper wasp building her nest. It would be an excellent box to keep a close eye on, since I walk by it frequently!
The photo is one of a bluebird parent and fledgling that I took in the Garden a couple of seasons ago.