求翻译：Gentoo (Pygoscelis papua)(sub-antarctic islands), adélie (Pygoscelis adeliae)(Antarctic coasts) and chinstrap penguins (Pygoscelis antarctica) (Antarctic Peninsula) breed in the southern spring. Females lay only one egg usually and males share in incubation and chick rearing. Predation by brown skuas and sheathbills is是什么意思？

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