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BiologyPairs occupy permanent territories of 8 to 14 km stretches of river (4), depending on the availability of suitable nesting and feeding sites (6). Nests are built in tree cavities and rock crevices (4). The breeding season is thought to last from June to August, but may vary geographically (4), and broods of between two and four chicks are usually raised (6). The Brazilian merganser feeds mainly on fish, which it captures by diving in river rapids and backwater, but supplements this diet with molluscs and insects and their larvae (2) (3). These birds usually feed in pairs (2).