Helmeted hornbill is a huge hornbill with round casque, featherless throat, spiky hair, and two very long tail feathers. Unlike other hornbills, its casque is solid (not hollow) and for some reason some people like it. It is sought as valuable item just like elephant's tusk. Overhunting has driven them to be critically endangered. This is the most challenging subject that I've attempted so far.
Notes about origami design and fold