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Breeding large gulls in Poland: distribution, numbers, trends and hybridisation.
Neubauer, G., M. Zagalska-Neuhauer, R. Gwiazda, M. Faber, D. Bukaciriski, J. Betleja & R Chylarecki
IN: Vogelwelt 2006-127: 11-22.
Fig. 3. Species structure in local large gulls populations, based on trapped birds (left side) and pair composition (right side) within the north-south gradient in Poland.
HG = Herring Gull (individuals left, pairs right),
CG = Caspian Gull,
YLG = Yellow-legged Gull,
HYB = hybrids or mixed pairs,
‘?’ = not identified individuals.
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Larus cachinnans