juvenile lack-headed gull in winter plumage in kelsey park, beckenham

animal avian beak beckenham bill bird birds birdwatching black blackheaded britain chroicocephalus closeup coast england environment feathers greater gull headed immature juvenile kelsey kent lackheaded lake larus london natural nature outdoor park plumage pond railing ridibundus sea seabird seagull standing stands water white wild wildlife wings winter