My friend Roberta looks after quite a few Eastern Bluebird boxes in the Eden Prairie, MN area. In the bumper crop years, she's had as many as 70. The cooler, wetter springs the last couple of years might have had a difference in the lower numbers she's seen lately. We went out on one day, and all of these bluebird boxes had chicks (or eggs) at different ages.
What materials are the boxes made out of? They look cool!
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