Sea lions are adaptable marine mammals that face welfare threats from fishing gear, pollution, and disease. Their urban adaptability creates unique coexistence challenges.
Sea lion welfare involves both dramatic acute events — El Nino starvation years that starve thousands of pups — and chronic background threats from entanglement and pollution. Domoic acid toxicity causes seizures and neurological damage that rescue facilities see in hundreds of cases annually. El Nino years produce influxes of starved pups and nursing mothers who must travel so far for prey that calves die from nutritional neglect. The Marine Mammal Center's rescue and rehabilitation work provides direct welfare benefit at individual level while documenting population-level threats. Sea lions adapting to urban environments face conflict with humans including illegal shooting — a serious welfare problem requiring enforcement attention and community education.