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-bird black-eye-stripe brown-duck grey-duck Pacific-black-duck pond wild-duck appearance background color colors colour colours dark lake light nature paddling pair reflections surface surfaces texture textured textures beautiful Dendrocygna eytoni eyes Eyton's Plumed feathers grass Grass Whistle Duck Grey or Red-legged Whistler Monkey Duck native ornithology plumed pretty Red-legged or Whistling Tree-duck resting standing Tree Duck wandering webbed feet whistling wild reflecting sunlight sunshine wild-life chick direction ducklings follow follow-the-leader following guidance guiding lead leading mother protection protective shade shadows