Dippers are unique aquatic passerines that walk underwater to feed on stream invertebrates, with welfare tightly linked to river water quality and invertebrate abundance.
Dipper welfare depends entirely on access to clean, invertebrate-rich fast-flowing water. River acidification from acid rain has eliminated dippers from many Welsh and Scottish streams by destroying the aquatic invertebrate communities they depend on. Pollution events including silage effluent and farm waste kill invertebrates and deplete food supply in territories. Winter droughts reduce river flow and concentrate invertebrates in small areas, increasing foraging competition. Welfare-focused river management maintains alkalinity, controls pollution, and preserves the invertebrate communities that make dipper territories viable.