Sub-adult Bonaparte’s Gull: Kennebunk, Maine, USA, June 2026 — While photographing our nesting Least Terns in light, this bird passed over relatively low. I knew it was not a Tern when I photographed it, but I had to look it up while processing the photos. It appears to be a sub-adult, perhaps first summer, Bonaparte’s Gull. A portion of the sub-adults are known to linger behind the adults the first year—and not make it to the Arctic breeding grounds—hanging out along the Atlantic coast and in the Gulf of Maine all summer. Sony a6700. Sigma 16-300 Contemporary at about 600mm equivalent field of view (cropped). Program with flight and action modifications. Processed in Photomator.