| 31. | On the head, the wild male has short crest on the nape.
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| 32. | There is a black-and-white chessboard pattern on the nape.
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| 33. | A girdle consisting of metal disks and cane chignon just above the nape.
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| 34. | Furthermore, the nape feathers are copper in colour.
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| 35. | No loops occur on the nape and associated areas.
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| 36. | Adults in breeding plumage have a black crown, nape and upper body.
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| 37. | The male has a white forehead, red crown, and yellow nape.
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| 38. | The nape is green and the sides of the neck are bright yellow.
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| 39. | Breeding plumage shows a red-brown crown and nape with black margins.
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| 40. | The head, nape and sides of neck are yellowish grey and olive.
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