Ключевые слова: adult plumage, adult winter plumage, animal, autumn, baltic, baltic sea, beach, bird, black headed gull, chroicocephalus, chroicocephalus ridibundus, coast, fall, fence, gdansk, gull, laridae, migratory birds, nature, ornithological, ornithology, pier, poland, railing, red legs, sea, sea bird, seagull, sunny, winter plumage,