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Nazca Booby (Sula granti) broods in the Galapagos Islands showed 0% extra-pair fertilization, based on multilocus band-sharing values. The 95% CI of this estimate for all chicks was 0–0.098, and for all broods it was 0–0.139. These are the first data on extra-pair paternity to be reported for a member of the family Sulidae.
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Anderson et al. (2006) studied this question.
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