Mel Smith and Linda Bostwick must be doubly fortunate, as they had two sets of birds nest in their birdhouse. The first to occupy the box were Chestnut-backed Chickadees. Once their chicks had fledged, Violet-green Swallows took residence and currently have chicks in the birdhouse.
Here's a photo Linda took a few years ago of a Violet-green Swallow with a feather in its beak. A nice soft touch for a nest!
Thanks to Mel and Linda for allowing me to share their photos with you here.