Archive image from page 69 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele187302darw Year: 1873 56 SEXUAL SELECTION: BIRDS. [Part II. by dark-blue plumes, which it can elevate into a great dome ro 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 Fig. 40.—The Umbrella-Bird, or Cephalopterus ornatus (male, from Brehm). scale-like blue feathers. It probably serves in part as an ornament, but likewise as a resounding apparatus, for
Archive image from page 69 of The descent of man, and. The descent of man, and selection in relation to sex descentofmansele187302darw Year: 1873 56 SEXUAL SELECTION: BIRDS. [Part II. by dark-blue plumes, which it can elevate into a great dome ro 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 Fig. 40.—The Umbrella-Bird, or Cephalopterus ornatus (male, from Brehm). 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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