group of juvenile herring gull birds - latin larus argentatus - on a water surface during the spring mating season in wetlands of

herring gull larus argentatus mewa srebrzysta narew biebrzanski national park narwianski bird pond lake water surface swim reserve avian wetland wetlands moor moors lakeland wildlife nature natural life ecology fauna poland europe wing wings beak tail neck color colorful wild zoology travel exterior outside outdoor group couple family herd