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1by Buehler, Deborah M, Piersma, Theunis“... focusing on the quality of breeding plumage and the timing of moult as indicators in the six subspecies...”
Published in Philosophical Transactions of the Royal Society B: Biological Sciences (2007)
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2by Lank, David B., Farrell, Lindsay L., Burke, Terry, Piersma, Theunis, McRae, Susan B.“... plumage and display behaviour, but 0.5–1.5% are faeders, which lack both. Females from a captive...”
Published in Biology Letters (2013)
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