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A map of the world with the knot's flyways (arrows), breeding grounds (dark grey surfaces) and wintering grounds (dots, scaled to estimated wintering population sizes). Distances (km) travelled between main wintering and breeding grounds are 9 000 (canutus), 4 680 (islandica), 15 000 (rufa), 15 000 (rogersi) and 10 400 (piersmai).
