Subsequently, Gould advised that the smaller southern Rhea specimen that had been rescued from a Christmas dinner was a separate species which he named Rhea darwinii, whose territory overlapped with the northern rheas.
Posteriormente Gould informou de que o pequeno ñandú do sur que fora salvado dunha cea de Navidad era unha especie nova que chamó Rhea darwinii, cun territorio que se solapaba parcialmente co dos ñandús do norte.