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    Marks on immature Yellow-legged Gull

    Hello Sue, these markings are often named (dark) shins in the literature and are a feature of 1st cycle Lesser black Gulls, but not diagnostic. See here, thanks Lou again! https://www.birdforum.net/threads/yellow-legged-or-lesser-black-backed-gull-hastings-uk.443365/#post-4504018 Edit: here...
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