High Quality Content by WIKIPEDIA articles! The Sumba Hornbill (Rhyticeros everetti) is a medium-sized, approximately 70cm long, blackish hornbill. The male dark reddish-brown on crown and nape, and paler neck. The female has an entirely black plumage. Both sexes have a large dull yellowish bill with maroon patch at base, a serrated casque, and an inflatable blue throat. An Indonesian endemic, the Sumba Hornbill is distributed to semi-evergreen forests of Sumba in the Lesser Sunda Islands. It is uncommon and found in the lowland to altitude up to 950 metres.