We were out of town and late opening our barn to our barn swallows. Unfortunately they are not nesting with us this year. Howeaver we found this new nest upon our return and we thought we had retained a breeding pair. However, the birds are not barn swallows. They have dark heads and whiter breasts, no blue tinge, and slightly bigger than our barn swallows. They also do not appear as agile.
I do not have a bird picture yet and the nest picture is not great. Definitely mud and moss.
I was hoping for some thoughts that I could research.