A hornbill which differs from all other similar species by the unspotted black wing coverts. The adult male has a large red- orange bill with a well-defined creamy-yellow tip while the adult female has an all black bill. The immature resembles the female, but has a duller bill and indistinct white spotting on the wing covers.

Calao de der Decken, Tocus deckeni (Cabanis, 1886), Avibase - the world bird database

http://avibase.bsc-eoc.org/species.jsp?avibaseid=DE36D3BDE3066D13

IOC World Bird Names, version 6.04:
   Von der Decken's Hornbill ( Tockus deckeni)(version 1)