. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. Fio. .32.âMcgalophrys TOontana. The two left-band flares, 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 al
. The descent of man, and selection in relation to sex. Evolution (Biology); Sexual selection in animals; Sexual dimorphism (Animals); Sex differences; Human beings. Fio. .32.âMcgalophrys TOontana. The two left-band flares, 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. Chelonia. âTortoises and turtles do not' offer well- marked sexual differences. In some species, the tail of *â > .1. Hishop, in ' Toild's Cyclop, of An;it. and Thys.' 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 company
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Keywords: ., bookcentury1800, bookdecade1870, booksubj, booksubjecthumanbeings
