There are over 20 species of cockatoos, each with their own behaviors and personalities, said Jody Rosengarten, a dog trainer, behavior therapist and parrot enthusiast. Cockatoos are highly social and in the wild will forage in flocks as large as 100 birds. The most widespread and numerous cockatoo species found in the wild is the 14-inch galah, which shows off its pink and gray wings throughout the skies of Australia. Pet owners are generally more familiar, however, with the 20-inch long sulfur-crested cockatoo, with its crest of narrow, golden, forward-curving feathers on its head, according to Encyclopedia Brittanica. Depending on the type of cockatoo, these birds are often white and are originally native to northern and eastern Australia, New Guinea and Tasmania.