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Are these all Heuglin's Gulls ?

Pics 1 & 2: 1st winter mongolicus (Yellow-legged Gull)
Pics 3 & 4: 1st winter and one adult heuglini (Heuglin's Gull)
Pic 5: 1st winter mongolicus
Pic 6: 1st winter heuglini

Geoff

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