Siberian Gulls
Larus heuglini


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Typical adult Siberian Gulls have black on the primaries from P10 to P4 or P10 to P3, a minimal grey tongue on the inner web of P10 showing beyond the under primary coverts, poor contrast on the upperside between P9 and 10 and the primary coverts, a fierce facial expression with a furrowed brow, a longish neck, legs and bill, duller soft parts than barabensis. Although some adult heuglini are said to arrest their primary moult during the autumn migration, it is hard to see any evidence of this amongst the flight shots.
The characteristics of adult heuglini overlap with those of barabensis, so it is possible that some of the birds with larger mirrors, whiter heads, shorter bills, and the presence of a tongue are this latter form.


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 Siberian Gull

    March 7, 2002

    adult perched and flying

 Siberian Gull

    March 9, 2002

    adults in flight

 Siberian Gull

    March 7, 2002

    adults in flight

 Siberian Gull

    March 9, 2002

    adults perched

 Siberian Gull

    March 9, 2002

    adults perched

 Siberian Gull

    March 12, 2002

    adults perched

 Siberian Gull

    March 9, 2002

    adults perched, with white heads

 Siberian Gull

    March 9, 2002

    adult with wings raised

 Siberian Gull

    March 18, 2002

    2nd or 3rd winter, arrested moult

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