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Non-breeding fæder Ruffs Philomachus pugnax associate according to sex, not morphology

by Verkuil, Yvonne I., Jukema, Joop, Gills, Jennifer A., Karlionova, Natalia, Melter, Johannes, Hooijmeijer, Jos C.E.W., Piersma, Theunis
Published in Bird Study (2008)