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three species have a keratinous, skin-covered casque on their heads that grows with age. The casque's shape and size, up to 18 cm, is species-dependent. C. casuarius has the largest and C. bennetti the smallest (tricorn shape), with C. unappendiculatus having variations in between. Contrary to earlier findings, the hollow inside of the casque is spanned with fine fibres. In 2026, scientists discovered that casques on both living and deceased cassowaries glow in ultraviolet light.

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