Iban people
Most species' casques are very light, containing much airspace. However, the helmeted hornbill has a solid casque made of a material called hornbill ivory, which is greatly valued as a carving material in China and Japan. It was used as a medium for the art of netsuke. Also used for hunting purposes in places like India. The Iban people of Borneo regards the Rhinoceros hornbill (known as Kemyalang) as the king of the worldly birds, who acts as the intermediary between the man and the God. However, in reality, the helmeted hornbill (Buceros vigil) called Tajai is the actual king of the worldly birds, having the largest body size and a solid casque with its arrival on any fig trees will always cause other birds including the Rhinoceros hornbill and other animals on the trees to fly away to let it feed. The Wreathed hornbill (Undan) is believed by the Iban people to be the guide of dead souls to the lower world.