Yellow-legged gull in the roost

This smart looking sub-adult yellow-legged gull was in the roost at Pennington Flash this evening. It's quite a slender, petite looking bird so perhaps a female. It's more or less a full adult except for a black mark in the red spot on the bill, which is pale rather than bright yellow.

 

It's the bird at the back.

Right hand gull.

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