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little-W | Studying gulls: Black-headed Gull, 1cy, M[Arnhem 3722xxx]
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little-W | Studying gulls: Black-headed Gull, 1cy, brown neck markings
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little-W | Studying gulls: Black-headed Gull, gray hind-neck
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little-W | Studying gulls: Black-headed Gull 1cy, M[Praha ES11.300]