Stock photography, photos: Sulphur crested cockatoos Stock photos of Photograph of Australian sulphur crested cockatoos in flight Photograph: © Gayle Knowles Click for a larger image and more information Keywords associated with this stock photo: cockatoo, sulphur crested, australia, bird, fly, flight, tree, branch, wing, roost, multi, many, feather, beak, parrot, white, perch, land