Biological Exuberance: Animal Homosexuality and Natural Diversity

For specific arguments against homosexual activity as a form of tension reduction in various species, see Yamagiwa 1987a:23, 1987b:37 (Gorilla); Edwards and Todd 1991:234-35 (White-handed Gibbon); Vasey 1996:549-50 (Japanese Macaque); R. Wrangham, in Weinrich 1980:291 (Gelada Baboon). Against homosexuality as a form of play, see Talmage-Riggs and Anschel 1973:71 (Squirrel Monkey); Lombardo et al. 1994:556 (Tree Swallow). Against homosexuality as reconciliation or reassurance behavior, see Vasey 1996:550 (Japanese Macaque); Akers and Conaway 1979:78 (Rhesus Macaque); Lombardo et al. 1994:556 (Tree Swallow). Against homosexual activities as a means of forging coalitions or alliances, see Silk 1994:285—87 (Bonnet Macaque) (and also Silk 1993:187 for arguments that coalition-bonding between males in this species is not “functional” in terms of enhancing the males’ status, access to resources, or inclusive fitness). Against homosexuality as a gesture of appeasement or placation, see Manson et al. 1997:783 (White-faced Capuchin); Ferron 1980:136 (Red Squirrel); Lombardo et al. 1994:556 (Tree Swallow). Against homosexual relations as “kinship alliances” between individuals who associate with each other primarily because they are related (so-called kin selection), see Fernández and Reboreda 1995:323 (Greater Rhea); Heg and van Treuren 1998:688-89, Ens 1998:635 (Oystercatcher); Afton 1993:232 (Lesser Scaup Duck); Rose 1992:104, 112 (Killer Whale); Hashimoto et al. 1996:316 (Bonobo). See also Vasey, “Homosexual Behavior in Primates,” for a summary and review of the evidence against many of these nonsexual “explanations.”

116

Japanese Macaque (Vasey 1996).

117

Bonobo (de Waal 1987, 1995 [among others]; Savage-Rumbaugh and Lewin 1994:110); Gorilla (Yamagiwa 1987a:23, 1987b:37).

118

See Silk 1994:285-87 (Bonnet Macaque) for more detailed discussion.

119

Signs of sexual arousal such as these have been documented for homosexual interactions in more than 90 species of mammals and birds. In addition, a number of scientists have themselves asserted the clearly sexual character of same-sex interactions (in addition to, or instead of, nonsexual aspects); see, for example, de Waal 1995:45—46 (Bonobo); Yamagiwa 1987a, Harcourt 1988:59, Porton and White 1996:724 (Gorilla); Edwards and Todd 1991 (White-handed Gibbon); Weber and Vogel 1970:76-77 (Hanuman Langur); Vasey 1996:550, Rendall and Taylor 1991:324, Wolfe 1984:147 (Japanese Macaque); Akers and Conaway 1979:78-79 (Rhesus Macaque); Chevalier-Skolnikoff 1976:525 (Stumptail Macaque); Srivastava et al. 1991 (Hanuman Langur); R. Wrangham, in Weinrich 1980:291 (Gelada Baboon); Manson et al. 1997:775-76 (White-faced Capuchin); Herzing and Johnson 1997:85, 90 (Bottlenose/Atlantic Spotted Dolphins); Saulitis 1993:58 (Killer Whale); Darling 1978:60, 1977:10—11 (Gray Whale); Coe 1967:320 (Giraffe); Rue 1989:313 (White-tailed Deer); Buss 1990:20 (African Elephant); Heg and van Treuren 1998:688 (Oystercatcher); Davis et al. 1998 (Adélie Penguin); Stiles 1982:216 (Anna’s Hummingbird). For use of the word erotic to characterize same-sex interactions, see, for example, de Waal 1987:323, 1997:103-4, Kano 1992:192, 1990:66 (Bonobo); Darling 1977:10—11 (Gray Whale); Mathews 1983:72 (Walrus); Buss 1990:19 (African Elephant).

120

Occasionally, however, multiple “functions” are granted to heterosexual behavior; see, for example, Lindburg 1971 (Rhesus Macaque); de Waal 1987, 1995, 1997, Kano 1990:67 (Bonobo); Manson et al. 1997 (White-faced Capuchin); Hanby, J. (1976) “Sociosexual Development in Primates,” in P. P. G. Bateson and P. H. Klopfer, eds., Perspectives in Ethology, vol. 2, pp. 1-67 (New York: Plenum Press).

Chapter 4. Explaining (Away) Animal Homosexuality

1

M. Grober, opening remarks to the plenary session on Sexual Orientation, 24^th International Ethological Conference, Honolulu, Hawaii, August 12, 1995.

2