squawking gull behavior perched on metal bar at waterfront

birding birders opportunistic feeders seabirds birds laridae black grey white breast golden beak stripe tail feathers harsh wailing 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 view behaviour wildlife aves wild cooperate cooperation sync mob mobbing group cluster colony ring billed bill sociable socializing socialize clever mate mating signalling body movements marine marina one legged balance balancing communicate communication skwawking plumage