The writhed hornbill (Rhabdotorrhinus leucocephalus), also known as the Mindanao wrinkled hornbill, is a species of hornbill in the family Bucerotidae. It is endemic to humid forests on the Philippine islands of Mindanao, Dinagat and Camiguin Sur. It formerly included the Walden's hornbill as a subspecies, but unlike that species, both sexes of the writhed hornbill have orange-red throat and peri-ocular skin. The writhed hornbill is threatened by habitat loss and hunting. References BirdLife Species Factsheet. writhed hornbill Endemic birds of the Philippines Birds of Mindanao Fauna of Dinagat Islands Fauna of Camiguin writhed hornbill Taxa named by Louis Jean Pierre Vieillot Taxonomy articles created by Polbot