Abstract This study of the behaviour of Mandarin Ducks Aix galericulata in north Northamptonshire is based on year-round observations over a four-year period, 2022–23, along a length of the River Nene and anadjacent former gravel-pit workings. Both the river and the gravel-pits are lined by reeds and willows Salix, the habitat largely used by the ducks. Aspects


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