The gigaku dance was a masked drama-dance performance imported into Japan in the Asuka period (AD538 to 710). This mask is in the form of the king of birds, Karura, a deified bird with a jewel grasped in its open beak, a topknot on its head, and layers of flesh hanging beneath its neck.

For an 8th century example in the collection of Miho Museum, Japan, go to:
http://www.miho.or.jp/booth/html/artcon/00000107e.htm
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