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Turbulent northern waters are favored by this strikingly patterned little duck. It is often found in summer on rushing rivers, diving and swimming against the current, climbing easily on steep and slippery rocks above the water. When moving inland, Harlequin Duck pairs usually fly low, following every bend of the river rather than taking overland shortcuts. In winter, seems to choose the roughest coastal water, with rocks pounded by the surf. Studies show that many Harlequin Duck adults have had broken bones, probably a result of their rough surroundings.