We were on holiday in southern Burgundy over the last couple of weeks, and were astonished at the lack of waterfowl on major watercourses there. We went to three towns on the banks of the river SaƓne, and also to the Canal du Centre, and I think we once caught a distant glimpse of a single swan; but that was it. No ducks, geese or any of the other species that proliferate on British rivers and canals. Do they put something in the water, or is there something else that keeps the birds away?