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“In the past, we could see heads of the bird in homes and people wore amulets made from casques,” he said by phone.

The helmeted hornbill is another one: critically endangered owing to land clearing for palm oil plantations, and poaching for its magnificent red ivory casque.

Much of the tissue under Jary's casque had been destroyed by the disease.

When a player for the Denver Nuggets shot an air ball, one of them reflexively shouted in French, “Oh là là! Mettez vos casques!”

But it's the hornbill's helmet, or casque, that sits on top of its bill that is pushing it to the brink of survival.