Intrasexual competition and sexual selection in cooperative mammals

@article{CluttonBrock2006IntrasexualCA,
  title={Intrasexual competition and sexual selection in cooperative mammals},
  author={Tim H. Clutton‐Brock and Sarah J. Hodge and G{\"o}ran Spong and Andrew F Russell and Neil R. Jordan and Nigel Charles Bennett and Lynda L. Sharpe and Marta B. Manser},
  journal={Nature},
  year={2006},
  volume={444},
  pages={1065-1068}
}
In most animals, the sex that invests least in its offspring competes more intensely for access to the opposite sex and shows greater development of secondary sexual characters than the sex that invests most. However, in some mammals where females are the primary care-givers, females compete more frequently or intensely with each other than males. A possible explanation is that, in these species, the resources necessary for successful female reproduction are heavily concentrated and intrasexual… 

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