Surprise

Whippoorwills and owls are now calling at night, and occasionally in daylight I inspect the bluebird box to make sure all is well (and that snakes and bats haven't invaded it). Removing the nest, I noticed with approval that it was lined with extra white fluff, unusual considering that bluebirds have no white feathers, and I was not expecting, at that moment, to see eggs in the nest, but I did. And was very surprised.

A bird that wasn't a bluebird, more like a chickadee, shot out from the box as I approached, and the rust-spotted ones must be her eggs; they match with other photos of chickadee eggs. Apparently the bluebird couple was evicted after producing one egg, and now their blue egg shares the nest with the other, smaller, spotted eggs. Never seen this before. Put it all back as it was. After the chickadees are hatched and raised I can clean out the box so the bluebirds will return and breed there.