aggressive Australian birds chroicocephalus novaehollandiae common gray and white grey and white gulls Larus novaehollandiae Noisy prolific resting river river's edge riverside sand scavengers screeching seagulls sepia silver gull standing wading waiting watching background color colored colors colour coloured colours cygnus-olor harmonious harmony leisure light paddling pair reflection reflections reflective ripples rippling river’s-edge serene serenity swans swimming synchronised synchronized tranquil tranquilly water water-birds waterways webbed-feet white white-swans breeze chroicocephalus-novaehollandiae cool cooling edge edges edging feathered feathers flow flowing gray-and-white grey-and-white huddled Larus-novaehollandiae path pavement paving reflecting river's-edge ruffled ruffling seabirds silver-gull waterbirds wind accommodation appearance appearances boat buildings contrast contrasting culture home house lifestyle moving outdoor outdoors outside recreation relaxation relaxed relaxing river-views shade shadow shadows shrubbery shrubs sunlight sunshine surfaces transport transportation travel vegetation views pontoon abstract aqua backdrop green lines liquid movement patterns surface texture textures vibrancy vibrant wallpaper water's-edge waterflow wavelets waves blue autumn dark darkened fall image impressionist lighting mirrored park peace peaceful perspective perspectives placid public reflected restful textured tranquillity trees waterside water’s edge alongside appropriate-behavior appropriate-behaviour barrier below care concern concrete danger dangerous dangers deep deep-water depth direction disused fence fencing foliage grass greenery handrails plants railing rails risk risks risky safety steps track trail tree wet covered exposed layers levels open rivers-edge rocks rocky rough shapes shore shoreline sparkle sparkling