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Egalitarianism in female African lions
C Packer1, A E Pusey, L E Eberly
1Department of Ecology, Evolution and Behavior, University of Minnesota, St. Paul, MN 55108, USA. packer@biosci.umn.edu
Female African lions exhibit egalitarian breeding, with companions producing similar offspring numbers. This symmetry arises because lions cannot control each other's reproduction due to high fighting costs and communal care dependence.
Area of Science:
- Behavioral Ecology
- Evolutionary Biology
- Animal Behavior
Background:
- Testing models of egalitarianism is challenging due to despotic social structures in most cooperative societies.
- Female African lions present a unique plural breeding system with consistent, similar offspring survival among companions.
Purpose of the Study:
- To investigate the reproductive skew and social dynamics in female African lions.
- To test theoretical predictions of reproductive skew models in a natural egalitarian system.
Main Methods:
- Observational study of female African lion social and reproductive behaviors.
- Analysis of offspring survival rates and group dynamics.
Main Results:
- Female lions were unable to control each other's reproduction, aligning with reproductive skew theory.
- High costs of fighting and limited access to newborn cubs prevent reproductive control.
- Females lack incentives to suppress companions' reproduction due to reliance on group territoriality and synchronous breeding.
Conclusions:
- Female African lion relationships are highly symmetrical, creating a rare egalitarian breeding system.
- Individual females act as "free agents," contributing to communal care only when they have their own cubs.
- This system provides a unique model for understanding egalitarianism in cooperative societies.
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