black-headed gulls - chroicocephalus ridibundus resting on a frozen lake.

adult alight avian bird birding birdwatching black blackheaded chroicocephalus closeup detail england fauna feather gull headed laridae nature ornithology outdoor plumage ridibundus seabird seagull water wetland white wild wildlife winter worcestershire aves black-headed gulls resting frozen flight immature second cycle european herring larus argentatus argenteus