I wish I could attract some swallows, as they like bugs, and we got bugs! We have managed to attract many of the swallows night-time counterparts...brown bats. It is amazing how their role in nature and even their flying style is so similar.
Al...not sure what your mystery bird might be...it seems to have same shape and size as bunting...could it be a female bunting?
Here is one from my backyard...
any guesses? Not too rare, but usually well hidden.