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. 2016 Jan 7;6:18952. doi: 10.1038/srep18952

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Note the nest rim in all cases. (b) cross section of Club Gulch dig trace with thin apron of displaced sand. Note lack of sediment rim. (a,b) drawn to approximately the same scale. c: map showing distribution of Kakapo nest scrape bowls, (modified after¹²).