Extra-pair copulation and sperm competition in the zebra finch

@article{Birkhead1988ExtrapairCA,
  title={Extra-pair copulation and sperm competition in the zebra finch},
  author={Tim R. Birkhead and Jayne Pellatt and Fiona M. Hunter},
  journal={Nature},
  year={1988},
  volume={334},
  pages={60-62}
}
Most birds are monogamous, but recent studies have shown that extra-pair copulations (EPCs) occur frequently1,2 despite a range of paternity guards, including mate-guarding and frequent copulation1. Although EPCs are known to result in extra-pair paternity3–5, there are no previous quantitative estimates of the success of EPCs in fertilizing eggs. We present here estimates of the likelihood of success of extra-pair copulations in a monogamous passerine, the zebra finch Poephila guttata. We show… 

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