Mammalian sexual differentiation: lessons from the spotted hyena.

Journal Article (Review;Journal Article)

Female spotted hyenas (Crocuta crocuta) are the only female mammals that lack an external vaginal opening. Mating and birth take place through a urogenital canal that exits at the tip of a hypertrophied clitoris. This 'masculine' phenotype spurred a search for an alternate source of fetal androgens. Although androstenedione from the maternal ovary is readily metabolized to testosterone by the hyena placenta, formation of the penile clitoris and scrotum appear to be largely androgen independent. However, secretions from the fetal testes underlie sex differences in the genitalia and central nervous system that are essential for male reproduction. Naturally circulating androgens, acting prenatally, reduce reproductive success in adult female spotted hyenas. Effects on aggression and dominance might offset these reproductive 'costs' of female androgenization in utero.

Full Text

Duke Authors

Cited Authors

  • Glickman, SE; Cunha, GR; Drea, CM; Conley, AJ; Place, NJ

Published Date

  • November 2006

Published In

Volume / Issue

  • 17 / 9

Start / End Page

  • 349 - 356

PubMed ID

  • 17010637

Electronic International Standard Serial Number (EISSN)

  • 1879-3061

International Standard Serial Number (ISSN)

  • 1043-2760

Digital Object Identifier (DOI)

  • 10.1016/j.tem.2006.09.005


  • eng