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А наши предположили, что это индийский подвид обыкновенной крачки longipennis. Кстати о находке такой как-то упоминал Зарудный (в Юго-Восточном Казахстане). Теперь понятно, где может быть собака зарыта.

Автор фотографий фотографировал Panasonic Lumix, причем даже не FZ-30 или 50, а более древним. Вероятно, есть некоторое нарушение цветопередачи.

Спасибо, что просветили! А то наши уже публиковать собираются.

Ну вот. Я уже было подумал, что все гениально просто, а вы все ........ Придется все-таки разбираться, что это за черноклювые крачки.

Я тоже больше склоняюсь к argentatus.

Спасибо за ответ! Рассылка - на yahoo - http://groups.yahoo.com/group/birdinggulls/. Можно подписаться и писать туда. Но там все на английском. Вот какие ответы я оттуда получил:
1) The bill is deep, blunt tipped and shows a stong Gonydeal Angle whilst the headshape is to square (doesn't show the low sloping forehead of cachinnans). There is a fair amount of streaking around the 'face' especially around the pale eye. Some cachinnans can show pale eyes but I've yet to see one this pale.

The legs look to me to be a little to thick set for cachinnans though this could be the angle, they're certainly pale and not as would be found on an argentatus.

The bird looks quite robust, lacking the overall elegant feel that is found in cachinnans
2) Hi
I think that it is a Herring Gull L.a.argentatus
3) I thought it was a Herring Gull as well. The mantle is too pale for YL Gull in my opinion.
4) Excluding Caspian Gull, which all seem to agree on, it would be
between Herring and Yellow-legged Gull. My immediate impression, had,
at first, nothing to do with plumage features, but more with
structure, although the angle is perhaps not favorable for such a
conclusion, and I´ll give anyone who doesn´t agree to that to some
credit. The gull is obviously a 3cy type, with no obvious white
tipped primaries and no visible mirror and almost all scapulars adult
like. Some median and lesser coverts are adult like, although these
feathers are slightly brownish- washed and may perhaps not represent
3rd generation feathers? Iris looks whitish and the orbital ring has
a yellowish tone and there might be some reddish in there (400%),but
the last is pure speculations since perhaps not wise to judge from
the image. The point is that a 3cy Herring Gull (preferable
argenteus?) could well match the gull in question on moult score at
this time of year. The primary projection is difficult to confirm due
to the angle. and one can have suggestions to whether the retained
brownish coverts and tertial bases should be more contrastingly dark,
not to mention the obviously barred Herring Gull like greater coverts
or if the inner greater coverts aught to be more adult like - in all
to fit a Yellow-legged better. To make a suggestion based on
upperpart tone from this image alone, although it does seem a bit
pale for a YLG, it is not advisable, for well known reasons. Maybe
it´s a Herring, maybe a YLG, but if I was forced to suggest either, I
would go for YLG, both on location (risky)and structure, with a focus
on head structure, which looks YLG squarish with a 'bull-necked'
impression and the bill shape/size match - but could could fit a
Herring as well.

Товарищи,а вот эта чайка из Марьино по рисунку ПМ похоже L.cachinnans?

В большинстве случаев это гадание на кофейной гуще. Главное, проверить нельзя! А умный вид всегда можно сделать.

Ну а может хотя-бы дать рекомендации на что обращать внимание когда снимаешь чаек? Какой ракурс, что-то еще. Какой свет желателен. Может со вспышкой?

Ну может хотя-бы в отношении серебристой и хохотуньи.