In the past, eight races (casuarius, tricarunculatus, bistriatus, lateralis, sclaterii, johnsonii, aruensis and bicarunculatus) or more were commonly recognized; however, extensive individual variation, together with confusion due to numerous and widespread introductions over centuries, and paucity of museum specimens and of reliable data on bare-part colours of known adult birds, all combine to confound attempts at building accurate picture of true geographical variation#R. Even type locality of this species is thought to refer to an introduced population. Monotypic.
Lowlands of New Guinea except watershed between Vogelkop and Huon Peninsula; Aru Is; NE Australia (two isolated populations in NE Queensland); also Seram, where probably introduced.
Food and feeding
Status and conservation
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