One of the hardest birds to get a decent photo of in my opinion. They dive under the water and can stay down for a LONG time and they will come up 20 yards away from where they went under...
On my walk yesterday, I met the ornithologist who maintains the bird houses and studies the nesting in the marsh. She said this little Tree Swallow greets her every day at this nest box. It was kind enough to pose for a picture for me...