Sea otters (Enhydra lutris) are a keystone species in kelp forest ecosystems, but face ongoing threats from oil spills, entanglement, and shark predation — with significant individual welfare implications.
Sea otters contaminated with oil cannot maintain body temperature — their fur loses insulating capacity, leading to hypothermia, starvation, and death even in relatively mild water. The process of dying from oil contamination involves extreme thermoregulatory failure, frantic grooming attempts, and progressive weakness over hours to days. Entanglement in fishing gear causes drowning in air-breathing marine mammals — a death involving hypoxia and distress. Individual sea otters that form strong social bonds with offspring or raft-mates experience disruption of those bonds through mortality events. The welfare recovery story of sea otters is genuinely positive — managed recovery programs have brought populations back from the brink, demonstrating that conservation investment directly improves animal welfare at scale.