Archive image from page 67 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele000darw Year: 1971 50 SEXUAL SELECTION: BIRDS. | I'art II. by dark-blue plumes, which it can elevate into a great dome no less than-five inches in diameter, covering the whole head. This bird has on its neck a long, thin, cylin- drical, fleshy appendage, which is thickly clothed with MI : V Pio. 40.—The Umbrella-Bird, or Cophaloptenm ornatus (male, from Ilrehm). scale-like blue feathers. It probably serves in part as an ornament, but likewise as a resounding apparatus
Archive image from page 67 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele000darw Year: 1971 50 SEXUAL SELECTION: BIRDS. | I'art II. by dark-blue plumes, which it can elevate into a great dome no less than-five inches in diameter, covering the whole head. This bird has on its neck a long, thin, cylin- drical, fleshy appendage, which is thickly clothed with MI : V Pio. 40.—The Umbrella-Bird, or Cophaloptenm ornatus (male, from Ilrehm). scale-like blue feathers. It probably serves in part as an ornament, but likewise as a resounding apparatus, for Mr. Bates found that it is connected ' with an unusual de- velopment of the trachea and vocal organs.' It is di- lated when the bird utters its singularly deep, loud, and
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