Eurasian river otters have recovered significantly across Europe after pollution controls, but ongoing threats from chemical pollution, road mortality, and habitat degradation continue to affect their welfare.
River otter welfare is directly tied to the health of the freshwater ecosystems they inhabit. Individual otters exposed to chemical pollutants suffer endocrine disruption and immune system effects that reduce reproductive success and individual health. Road mortality near water bodies, the most common cause of otter death in many European populations, causes acute trauma welfare events. The recovery of otters across much of Europe demonstrates what is possible when pollution is addressed at the legislative level, but the incomplete nature of that recovery, with many rivers still holding below optimal otter densities, indicates ongoing habitat and pollution challenges. Riparian management that maintains bankside vegetation, creates safe road crossings, and controls pollution inputs directly supports otter welfare at the individual and population level.