![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | "peacock" behavior and, 107, 108
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | protection of females and, 115
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | "rhino" behavior in, 107, 108, 111
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | success and lower testosterone husbands, 108, 109, 110
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | testosterone as aid to sex in, 100
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | testosterone levels and, 106112, 110
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | Masai tribe, Kenya, 72, 194, 200, 201
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | Masculinity
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | animals, 12
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | human, 1215, 34, 40, 72
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | mechanical ability as, 5657
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | occupations and, 40, 135. See also Occupations.
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![](/files/03/73/87/f037387/public/a174427bdf448e53ce20e149b0ddeee1.gif) | parenting and, 211
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