|Juvenile Yellow-legged Gull|
The other YLG's of a similar age had replaced most of their mantle and scapular feathers along with some of their coverts like the one in the photograph below:
The other one (pictured below) was a second-winter bird and although its general character fits YLG, its plumage is not typical. It is much darker than I'd expect and it is very similar to the second-year Lesser Black-backed Gull behind it. The bill appears good for YLG as does the dark mask behind the eye and the large head size. It is resident in Portugal which helps point towards it being a YLG, as LBBG should move north in summer. It is healthy and able to fly as it moves along the coast between Portimao and Quarteira. Once again the plumage could be retarded due to the time it spent being rehabilitated. I might struggle with one like this if it turned up at Shawell.
|Second-Year Yellow-legged Gull|
Below is a more typical second-year YLG:
|Second-year Yellow-legged Gull|