A new 1st calender Baltic Gull on site today, otherwise not a lot of birds about really today. Note the damaged tertials and greater covert's on this bird, a rather small bird..
Above: two shots of the same bird, a Herring Gull. Of interest note the rather worn tertials which now appear rather like on might expect of Yellow-legged Gull, though other features reveal its true identity. Note for example the inner primaries in flight, a bright panel in line with Agentatus. The tail was also that of Herring Gull, along with structure. Note the lightly toned underwing markings.
Another first calender Argentatus, this bird turned up a few days ago, a rather lanky looking bird on the water, interesting tertials, though again other features determine identification as Herring Gull. These birds are variable though weighing up all the features invariably sorts out identity. Note the plain toned first generation scapulars and lack of general wear on the upperparts, probably a late hatched bird.
Photos and discussion from routine gull check at Skeppsbron...