High Quality Content by WIKIPEDIA articles! Von der Decken`s Hornbill (Tockus deckeni) is a hornbill. Hornbills are a family of tropical near-passerine birds found in East Africa, especially to the east of the Rift Valley, from Ethiopia south to Tanzania. It is mainly found in thorn scrub and similar arid habitats. It often includes Jackson`s Hornbill as a subspecies. It was named after the German explorer Baron Karl Klaus von der Decken (1833–1865).