beak bird finch grass plant seed eater small water endangered grass eater horn killed poached rhino white rhinoceros animal grass-eater mammal nature resting rhinoceros wildlife Australian cockatoo galah grass feeder gray pink and grey abundant affectionate Australia-wide Australian-parrots Australian-pink-cockatoo common eolophus-roseicapillus familiar friendly galahs grass-feeder intelligent parrot pet pink-and-grey rose-breasted-cockatoo rose-pink roseate-cockatoo rosies seed-eater social widespread willock-cockatoos