River habitat restoration that improves water quality, restores bank vegetation, and reduces disturbance directly benefits otter welfare at the population level.
River restoration that improves otter habitat is a welfare intervention at the population level, improving conditions for many individual animals simultaneously. The recovery of otter populations following clean water legislation demonstrates how systemic environmental improvement translates to wildlife welfare — fewer individual otters dying from organochlorine poisoning, more breeding females with adequate prey to support litters, more suitable holt sites available for raising young. Donating to or advocating for river restoration projects is a genuine wildlife welfare action whose effects persist for decades and benefit many species beyond otters.