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(note - there is also a specific word for budgerigar - wityerrikong. Given that 'tuthər' is from an older interview by Stone it is possible that it refers to another grass parrot but historically 'warbling grass parrot' was a common name for 'budgerigar'. (image - Budgerigars or Warbling Grass Parrots by Laurie Boyle - Flickr - CC with thanks)