Great back-backed gulls
We normally get these large gulls in late August to early September, so they are right on time. There is no mistaking the adults for any other gull. Rondeau Provincial Park, Ontario, Canada, August 30, 2025, Larus marinus This is the largest gull in the world. Its broad wings and powerful appearance give it a regal look that have impressed naturalists for years. In the words of one early observer: “It surely seemed to be a king among the gulls, a merciless tyrant over its fellows, the largest and strongest of its tribe. No weaker gull dared to intrude upon its feudal domain.” The average length of 71-79 cm (28-31 inches), a weight of 1300-2000 g (46-70 oz), and a wingspan of 146-160 cm (57.5-63 inches) The oldest Great Black-backed Gull on record was at least 26 years, 9 months old, when it was spotted in new Jersey in 1994 and identified by its band. It had been banded in Massachusetts in 1968. source- allaboutbirds.org