well I don't know much, but it lives on the island of sulu in the Philippines. Its scientific name is anthraceros montani, I think? Very few pictures of this species have been taken, but there is a picture on the oriental bird gallery. It is a large black species, with a white tail band, and a conspiceous black casque. It is, to my knowledge, doomed to become extinct soon, because there are not as many programmes set up for this species as the other philippine hornbills.
The visayan writhed hornbill lives on the isalnds of Panay and Negros in the philippines. Most pictures are of a male taken by John hornbuckle. This species was treated to be conspefic to the writhed hornbill that is a resident of mindanao, and is kept at Chester. There are several threats to this species, the deforestation being the largest.
I will write about other endangered hornbills later.