animal avian background beak bird canada Canadians clipping color cutout facing fauna feathers freshwater front game goose image isolated nature nobody one ornithology path watching water waterfowl white wild wildlife wings Australian breeding burrows control damage damaging danger destructive devastating digging ecosystem environmental erosion feral invasive mammal mammalian pest pest pest control populated prolific rabbits reproductive spread threat uncontrollable widespread beaks birds blue branches Cockatoos corellas demonstrative docile eucalyptus-tree flock garden pest grazing gum-tree native Noisy pet root eater show-off talker tree vocal chase tease Australian pelican band banded bill colored colorful colors colour coloured colourful colours large leg band monitored monitoring pelecanus conspicillatus pelican powerful resting strong water bird anas superciliosa aquatic bird black eye-stripe brown duck common dark-brown duck fowl grey duck omnivore omnivorous Pacific black duck ripples rippling swimming waterbird wild duck Australian-pelican black grooming pelecanus-conspicillatus pelicans stretching water-birds Columba-livia-domestica domestic-pigeon fancy-pigeons feeders gregarious iridescence iridescent pests pigeon pigeons plumage plumage-varieties roof roofing tiled tiles tiling variations variety anas-superciliosa aquatic-bird black-eye-stripe brown-duck grey-duck Pacific-black-duck pond wild-duck