When I saw this pair and several other small swift birds flying around bird nests built for them in Fern Ridge Wildlife Area, I assumed they were Tree Swallows. But the color of the male was more purple than blue and their beaks were different. When I checked my bird book and All About Birds online, I learned that they were actually Purple Martins, the first I have seen! It was a thrill! Also, it looks like the male has been banded!

Here is a link about the Purple Martin at 'All About Birds' - http://www.allaboutbirds.org/guide/Purple_Martin/media-browser/68280401