Kin selection and cooperative courtship in wild turkeys

@article{Krakauer2005KinSA,
  title={Kin selection and cooperative courtship in wild turkeys},
  author={Alan H. Krakauer},
  journal={Nature},
  year={2005},
  volume={434},
  pages={69-72}
}
In the few species of birds in which males form display partnerships to attract females, one male secures most or all of the copulations. This leads to the question of why subordinate males help in the absence of observable reproductive benefits. Hamilton's concept of kin selection, whereby individuals can benefit indirectly by helping a relative, was a crucial breakthrough for understanding apparently altruistic systems. However in the only direct test of kin selection in coordinated display… 
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Inclusive fitness of ‘kissing cousins’: new evidence of a role for kin selection in the evolution of extra‐pair mating in birds
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    Molecular ecology
  • 2011
TLDR
An analysis of mating patterns with respect to genetic relatedness of social and extra‐pair partners in the ground tit, a facultative cooperative breeder in which socially monogamous pairs occasionally form cooperative groups with unpaired helper males, shows that females in both bi‐parental and cooperative groups preferentially engaged in extra‐ Pair matings with relatives, irrespective of relatedness to their social mates.
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References

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TLDR
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TLDR
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TLDR
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