For Bighorn and Thinhorn Sheep, heterosexuality is definitely not “normal”.
From “Evolution’s Rainbow: Diversity, Gender, and Sexuality in Nature and People ” (Joan Roughgarden):
“The females live separately from the males. The sexes associate only during the breeding season, from mid fall to early winter. A female is receptive for about three days, and will not allow herself outside of these three days.”
This emphatically does not mean that the males endure sexual abstinence for the rest of the year.
The males have been described as `homosexual societies`. Almost all males participate in homosexual courting and copulation. Male-male courtship begins with a stylized approach, followed by genital licking and nuzzling, and often leads to anal intercourse in which one male, usually the larger, mounts the other. The mounted male arches his back, which is identical to how a female arches her back during heterosexual intercourse. The mounting male ahs an erect penis, makes anal penetration, and performs pelvic thrusts leading to ejaculation.
The few males who do not participate in male sex are described as “effeminate”,. These males are identical tin appearance to other males but behave quite differently. They differ from “normal males” by living with the ewes rather than joining the all-male groups. These males do not dominate females, are less aggressive overall, and adopt a crouching, female urination posture. These males refuse mouning by other males. These nonhomosexual males are considerd “aberrant”, with speculation that that some hormone deficiency must underlie their behaviour. Even though in physical appearance, including body size and horn development, these males are indistinguishable from other males, scientists urge further study of their endocrinological profile.
This case turns the meanings of normal and aberrant upside down. The “normal” macho bighorn has full-fledged anal sex with other males. The “aberrant” male is the one who is straight – the lack of interest in homosexuality is considered pathological. Now, why would being straight be a pathology, requiring a hormonal checkup? According to the researchers, what’s aberrant is that a macho-looking bighorn ram acts feminine! He pees like a female – even worse than being gay.
Also See Previous QTC Posts:
Also The effeminate sheep and other problems with natural selection (at “Seed Magazine”)
Roughgarden, Joan: Evolution’s Rainbow: Diversity, Gender, and Sexuality in Nature and People Sommer,
Volker and Vasey, Paul: Homosexual Behaviour in Animals: An Evolutionary Perspective