Moluccas; error = Mindanao, Philippines.
Sometimes placed in Rhyticeros or Aceros. Has been suggested to form a species-group with R. corrugatus and R. waldeni, with Rhyticeros cassidix also in this group. Often considered conspecific with R. waldeni, but differs in plumage and bare-part colours, and in degree of sexual dimorphism in colour of facial skin. In the past was sometimes treated as conspecific with R. corrugatus, but differs markedly in numerous aspects of morphology. Monotypic.
Dinagat, Camiguin Sur and Mindanao (S Philippines); also, reported by local inhabitants on Siargao.
Food and feeding
Status and conservation
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