gull behavior perched on metal bar at waterfront close up

birding birders opportunistic feeders seabirds birds laridae black grey plumage plummage white breast golden beak stripe tail feathers harsh wailing skwawking scavengers sea ocean shore shoreline coastal environment coastline species herring california western slaty backed footed heermann adult adolescent winter humans hanging perch rest resting proximity harbor seaside town view behaviour wildlife aves wild comunicate comunication cooperate cooperation sync mob mobbing group cluster colony ring billed bill folks sociable socializing socialize understanding clever mate mating signalling body movements marine marina