If I’m not mistaken these are Forster’s Terns in winter plumage. I found these little guys while kayaking at low-tide near Beaufort, NC. Low-tide is a busy time in estuaries as a lot of the residents are out feeding in the tidal pools and on the mud flats. The terns were no exception and were busily flying around and dive bombing into the water in search for breakfast. These guys are certainly some fast little birds making getting the flight shots a bit challenging.