. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 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
. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. 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 ; It is di- lated when the bird utters its singularly deep, loud, and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Darwin, Charles, 1809-1882. New York: D. Appleton and Company
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Keywords: ., bookcentury1900, booksubjectevolutionbio, booksubjecthumanbeings
