| ductive Strategies Among the Ache: Part 2," in Laura Betzig, Monique Borgerhoff Mulder, and Paul Turke, eds., Human Reproductive Behavior: A Darwinian Perspective (Cambridge: Cambridge University Press, 1988), pp. 291305.
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| 48. David Attenborough, The Life of Birds (Princeton: Princeton University, 1998). See also The Life of Birds [video], narr. David Attenborough (Washington, D.C.: Public Broadcasting System).
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| 49. Steven W. Gangestad and Jeffry A. Simpson, "The Evolution of Human Mating: Trade-offs and Strategic Pluralism," Behavior and Brain Sciences , in press.
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| 50. Ellen D. Ketterson and Van Nolan Jr., "Hormones and Life Histories: An Integrative Approach," The American Naturalist , Vol. 140 (1992), pp. S33S62.
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| 51. K. E. Hunt, T. P. Hahn, and J. C. Wingfield, "Endocrine influences on parental care during a short breeding season; testosterone and male parental care in Lapland longspurs (Calcarius lapponicus)," Behavioral Ecology and Sociobiology , Vol. 45 (1999), pp. 360369.
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| 52. R. Knapp, J. C. Wingfield, and A. H. Bass, "Steroid Hormones and Paternal Care in the Plainfin Midshipman Fish ( Porichthys notatus )," Hormones and Behavior , Vol. 35 (1999), pp. 8189.
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| 53. Alan Booth and James M. Dabbs, Jr., "Testosterone and Men's Marriages," Social Forces , Vol. 72 (1993), pp. 463477. Also see Elizabeth Cashdan, "Hormones, Sex, and Status in Women," Hormones and Behavior , Vol. 29 (1995), pp. 354366.
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| 54. Allan Mazur and J. Michalek, "Marriage, Divorce, and Male Testosterone," Social Forces , Vol. 77 (1998), pp. 315320.
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| 55. D. J. Gubernick, C. M. Worthman, and J. F. Stallings, "Hormonal Correlates of Fatherhood in Men: A Preliminary Report," presented at the International Society for Developmental Psychobiology meeting, Newport Beach, October, 1992. See also, Carol M. Worthman, J. F. Stallings, and D. Gubernick, "Measurement of Hormones in Blood Spots: A Non-isotopic Assay for Prolactin," American Journal of Physical Anthropology [Supplement No. 12] (1991), pp. 186187.
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| 56. See Beth Azar, "Sex Differences May Not Be Set at Birth," APA Monitor , October, 1998; S. M. Breedlove, "Sex on the Brain," Nature , Vol. 389 (1997), p. 801; and B. M. Cooke, G. Tabibnia, and S. M. Breedlove, "A Brain Sexual Dimorphism Controlled by Adult Circulating Androgens," Proceedings of the National Academy of Science , Vol. 96 (1999), p. 75387540.
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| 57. See Sharon M. Pearcey, Karen J. Docherty, and James M. Dabbs, Jr., "Testosterone and Sex Role Identification in Lesbian Couples," Physiology and Behavior , Vol. 60 (1996), pp. 10331035; and Devendra Singh, M. Vidaurii, R. J. Zambarano, and James M. Dabbs, Jr., "Behavioral, Morphological, and Hormonal Correlates of Erotic Role Identification Among Lesbian Women," Journal of Personality and Social Psychology , Vol. 76 (1999) pp. 10351049.
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