This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
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Casque: A helmet-like structure or protuberance.
Coverts: Small feathers concealing the bases of larger primary feathers, usually on the wings or tail.
Mantle: In birds, the wings, shoulder feathers and back, when coloured differently from the rest of the body.