Media type: E-Article Title: Females increase offspring heterozygosity and fitness through extra-pair matings Contributor: Foerster, Katharina; Delhey, Kaspar; Johnsen, Arild; Lifjeld, Jan T.; Kempenaers, Bart imprint: Springer Science and Business Media LLC, 2003 Published in: Nature Language: English DOI: 10.1038/nature01969 ISSN: 0028-0836; 1476-4687 Keywords: Multidisciplinary Origination: Footnote: