 | "peacock" behavior and, 107, 108
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 | protection of females and, 115
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 | "rhino" behavior in, 107, 108, 111
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 | success and lower testosterone husbands, 108, 109, 110
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 | testosterone as aid to sex in, 100
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 | testosterone levels and, 106112, 110
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 | Masai tribe, Kenya, 72, 194, 200, 201
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 | Masculinity
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 | animals, 12
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 | human, 1215, 34, 40, 72
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 | mechanical ability as, 5657
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 | occupations and, 40, 135. See also Occupations.
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 | parenting and, 211
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