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Organism
  Animalia
      Chordata
            Aves
              Avialae
                    Ciconiiformes
                      Ciconii
                            Podicipedidae
                                     Aechmophorus
                                             Aechmophorus clarkii
                                             Aechmophorus occidentalis
                                     Podiceps
                                             Podiceps auritus
                                             Podiceps grisegena
                                             Podiceps nigricollis
                                     Podilymbus
                                             Podilymbus gigas
                                             Podilymbus podiceps
                                     Tachybaptus
                                             Tachybaptus dominicus