The illegal trade in elephant tusks is well reported, but there’s a type of “ivory” that’s even more valuable. It comes from the helmeted hornbill – a bird that lives in the rainforests of East Asia and is now under threat. PHOTO: Science Photo Library

Throughout history, the human desire for ivory—used in products from jewelry to piano keys to priceless religious art objects—has far outmatched efforts to stop the killing of elephants for their tusks. A smaller, feathered species, too, feels threatened thanks to the ‘prized’ casque it wears on its head: the Helmeted Hornbill.

Helmeted hornbills live in Malaysia and Indonesia. On the islands of Sumatra and Borneo their maniacal calls and hoots resonate through the rainforest. They have a reputation for being secretive and wary, though, and you’re more likely to hear them than see them.They have good reason to be shy – thousands are killed each year for their casques, shot by hunters who sell the heads to China. Between 2012 and 2014, 1,111 were confiscated from smugglers in Indonesia’s West Kalimantan province alone. Hornbill researcher, Yokyok Hadiprakarsa, estimates that about 6,000 of the birds are killed each year in East Asia.The casque, for which hunters are willing to risk arrest and imprisonment, is sometimes referred to as “ivory”. It’s a beautiful material to carve, smooth and silky to the touch, with a golden-yellow hue, coloured by secretions from the preen gland – most birds use their heads to rub protective oils from this gland over their feathers, legs and feet.

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