... to clean out your bluebird boxes. Cleaned out the two I have in my yard today, and both were full of last year's nesting materials. One house was used three times, twice by a pair of tree swallows early in the season and contained five failed eggs from the first attempt, more nesting material added and that second nest contained three failed eggs. And on top of that a third nest was built by bluebirds. I watched four youngsters fledge from this box in mid-August last year. I had seen the tree swallow pair early in the season, but had no idea they'd had two failed attempts. Surprised that the bluebirds nested on top of those failed nests.
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