Eurasian otters (Lutra lutra) have recovered remarkably in the UK after near-extinction from pesticide pollution. Understanding their ongoing welfare challenges helps sustain this conservation success.
Otter welfare in the UK is closely tied to waterway quality and road infrastructure. Despite population recovery, individual otters face significant threats. Road deaths cause traumatic injuries — otters crossing roads to access territories or following flooded rivers onto road surfaces are struck by vehicles, often causing prolonged suffering if not immediately fatal. Agricultural runoff causing algal blooms and fish kills creates food scarcity that forces otters to expand territories into higher-risk areas. Otter spraints (droppings) used in population surveys also reveal pollutant accumulation — mercury, PCBs, and emerging contaminants bioaccumulate through the fish food chain into otter tissues, causing sub-lethal health effects. Maintaining otter welfare requires integrated management of waterway pollution, road crossing infrastructure, and riparian habitat.