anas superciliosa aquatic bird Australian bird black eye-stripe brown duck common dark-brown duck fauna fowl grey duck omnivore omnivorous Pacific black duck waterbird waterfowl widespread wild duck grey orange swimming water ripples rippling anas-superciliosa aquatic-birds bank birds black-eye-stripe brown-duck chroicocephalus-novaehollandiae color colour differences diversity ducks edge grass grassy gray-and-white grey-and-white grey-duck gulls harmonious harmony lake lakeside Larus-novaehollandiae non-threatening not-threatened Pacific-black-duck quiet relaxed relaxing resting seabirds seagulls shadows silver-gull slope sunlight sunshine together waiting waterbirds wild-ducks wild-life aquatic-bird pond wild-duck beautiful Dendrocygna eytoni eyes Eyton's Plumed feathers Grass Whistle Duck Grey or Red-legged Whistler Monkey Duck native nature ornithology plumed pretty Red-legged or Whistling Tree-duck standing Tree Duck wandering webbed feet whistling wild appearance background colors colours dark light paddling pair reflections surface surfaces texture textured textures reflecting chick direction ducklings follow follow-the-leader following guidance guiding lead leading mother protection protective