I began my Potter Marsh birding on the boardwalk. There was no sign of the Common Yellowthroat that has been there recently.
The most obvious birds at the Potter Marsh boardwalk were the swarms of Tree Swallows, mostly newly flying young of the year over and around the boardwalk.
At the end of the boardwalk the two Bald Eagles were perched and were what most of the visiting tourists were gathering to watch.
Mostly I spent my time at Potter Marsh watching two Arctic Terns feed a youngster. While I was there the little one must have eaten more than its weight in little fish. It was very difficult to make myself leave the terns.
After I left I did drive the back side of the marsh before quitting birding for the day, and saw a perched Belted Kingfisher that stayed even though I stopped the car and took pictures.