. The descent of man, and selection in relation to sex. Evolution; Natural selection; Sexual selection in animals; Human beings -- Origin; Sexual dimorphism (Animals). Fig. 32.âMegalophrys montana. The two left-hand figures, the male ; the two right-hand figures, the female. ders, standing out one on each side of the head, near the corners of the ; The croak of the male is thus rendered exceedingly powerful; while that of the female is only a slight groaning The vocal organs differ considerably in structure in the several genera of the family ; and their development in all
. The descent of man, and selection in relation to sex. Evolution; Natural selection; Sexual selection in animals; Human beings -- Origin; Sexual dimorphism (Animals). Fig. 32.âMegalophrys montana. The two left-hand figures, the male ; the two right-hand figures, the female. ders, standing out one on each side of the head, near the corners of the ; The croak of the male is thus rendered exceedingly powerful; while that of the female is only a slight groaning The vocal organs differ considerably in structure in the several genera of the family ; and their development in all cases may be attrib- uted to sexual selection. Reptiles. â Chelonia.âTortoises and turtles do not offer well- marked sexual differences. In some species, the tail of 43 J. Bishop, in 'Todd's Cyclop, of Anat. and Phys.' vol. iv. p. 1503. ** Bell, ibid. pp. 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 Co.
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Keywords: ., boo, bookcentury1800, bookdecade1870, booksubjectnaturalselection
