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Is this unusual behavior? I put up a chickadee nesting box at the end of last summer and it sat empty, of course, until this spring when it appears to have been used three times to date. The first use, back in March, was by a pair of Black-capped Chickadees. They seemed to build the nest and incubate for a couple of weeks. I couldn't tell if they were feeding any chicks after that, but there was suddenly no activity for a few days. Then a pair of Chestnut-backed Chickadees appeared, and there was activity all of April, including a good number of days of obvious feeding. Unfortunately I missed seeing the little ones. Again, no activity for a week or more, and now, beginning about May 3, it seems like there is another pair of Chestnut-backed ones using the nest. One has been going into the box for about 10 seconds, then leaving. I presume he is feeding his mate. This makes three pairs using the same nest this spring. I can't find any info about different Chickadees using the same nest in a season.