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 breeze chroicocephalus-novaehollandiae colors colours cool cooling edge edges edging feathered feathers flow flowing gray-and-white grey-and-white huddled Larus-novaehollandiae path pavement paving reflecting ripples rippling river's-edge ruffled ruffling seabirds silver-gull water waterbirds wind abstract appearance aqua backdrop background color colour green light lines liquid movement moving patterns reflection reflections surface texture textures vibrancy vibrant wallpaper water's-edge waterflow wavelets waves blue accommodation appearances boat buildings contrast contrasting culture home house leisure lifestyle outdoor outdoors outside recreation relaxation relaxed relaxing river-views river’s-edge shade shadow shadows shrubbery shrubs sunlight sunshine surfaces transport transportation travel vegetation views waterways pontoon autumn dark darkened fall image impressionist lighting mirrored park peace peaceful perspective perspectives placid public reflected restful serenity textured tranquil tranquillity trees waterside water’s edge covered exposed layers levels open rivers-edge rocks rocky rough shapes shore shoreline sparkle sparkling action active activity adult anchorage anchored Australia boats buoys care city city skyline cityscape dangers enjoy fast luxury manoeuvrability mobility motor boat motoring pastime Perth popular power quick safety sailing security skill speed sport summer water sports wealth