The birds include macaws, South American parrots, and Australian cockatoos. Huge flocks of budgerigars, cockatoos, corellas and galahs are often sighted. Several species of parrots, cockatoos, and owls are kept as pets. Australian parrots comprise a sixth of the world's parrots, including many cockatoos and galahs. This small zone houses some of the park's parrot species, mostly macaws, conures and cockatoos. Black cockatoos are almost exclusively left-footed (along with nearly all other cockatoos and most parrots). Like most other cockatoos, galahs create strong, lifelong bonds with their partners. Unequivocally recognizable dabbling ducks, plovers, typical owls, cockatoos and crows appear during the Miocene. Dublin Zoo holds the European studbook for Moluccan cockatoos. Baudin's black cockatoos and emus are frequently observed in the park. Palm cockatoos are hunted in New Guinea. The white cockatoos are more often encountered in aviculture than the black cockatoos. Trained cockatoos are sometimes seen in bird shows in zoos. Several calls of red-tailed black cockatoos have been recorded. White cockatoos are more commonly found in captivity than black cockatoos.