Sex Differences in Spotted Hyenas
- 14 October 2021
- journal article
- research article
- Published by Cold Spring Harbor Laboratory in Cold Spring Harbor Perspectives in Biology
- Vol. 14 (6), a039180
- https://doi.org/10.1101/cshperspect.a039180
Abstract
The apparent virilization of the female spotted hyena raises questions about sex differences in behavior and morphology. We review these sex differences to find a mosaic of dimorphic traits, some of which conform to mammalian norms. These include space-use, dispersal behavior, sexual behavior, and parental behavior. By contrast, sex differences are reversed from mammalian norms in the hyena's aggressive behavior, social dominance, and territory defense. Androgen exposure early in development appears to enhance aggressiveness in female hyenas. Weapons, hunting behavior, and neonatal body mass do not differ between males and females, but females are slightly larger than males as adults. Sex differences in the hyena's nervous system are relatively subtle. Overall, it appears that the “masculinized” behavioral traits in female spotted hyenas are those, such as aggression, that are essential to ensuring consistent access to food; food critically limits female reproductive success in this species because female spotted hyenas have the highest energetic investment per litter of any mammalian carnivore. Evidently, natural selection has acted to modify traits related to food access, but has left intact those traits that are unrelated to acquiring food, such that they conform to patterns of sexual dimorphism in other mammals.Keywords
This publication has 59 references indexed in Scilit:
- Sibling rivalry: training effects, emergence of dominance and incomplete controlProceedings. Biological sciences, 2012
- Lifetime selection on a hypoallometric size trait in the spotted hyenaProceedings. Biological sciences, 2011
- Sex and the Frontal Cortex: A Developmental CT Study in the Spotted HyenaBrain, Behavior and Evolution, 2010
- What the hyena's laugh tells: Sex, age, dominance and individual signature in the giggling call of Crocuta crocutaBMC Ecology, 2010
- Post-weaning maternal effects and the evolution of female dominance in the spotted hyenaProceedings. Biological sciences, 2009
- Distribution of vasopressin in the forebrain of spotted hyenasJournal of Comparative Neurology, 2006
- Rare male aggression directed toward females in a female‐dominated society: Baiting behavior in the spotted hyenaAggressive Behavior, 2003
- True paternal care in a multi-male primate societyNature, 2003
- Territorial Behaviour by a Clan of Spotted Hyaenas Crocuta crocutaEthology, 1991
- Competitive behavior in male, female, and pseudohermaphroditic female dogs.Journal of Comparative and Physiological Psychology, 1982