4 Types of Sea Lions in California

The California sea lion is a marine mammal with a streamlined body, sleek brown or tan fur, and a distinctive ability to rotate its front flippers almost 90 degrees. This rotation allows it to move on land more easily than other seals, galloping and turning quickly. Adult males can weigh up to 860 pounds and reach 8 feet long, while females are smaller at 5 to 6 feet. They are highly social and vocal, producing barks, growls, and clicks that carry both in water and on land. Their ears are visible external flaps, unlike the earless true seals. California sea lions live 20 to 30 years in the wild.

Steller sea lions are substantially larger than California sea lions, with males reaching up to 11 feet and weighing over 1,500 pounds. Their fur is thicker and ranges from blonde to reddish-brown, compared to the California sea lion's darker brown coat. Steller sea lions have a more massive head and broader chest, and their roar is deeper and more powerful. Both can rotate their flippers, but Stellers move more slowly on land. Stellers prefer cooler waters and are concentrated in northern California and beyond, while California sea lions thrive throughout the state. If you see a group hauled out together, California sea lions are typically more active and vocal, while Stellers rest more quietly.

Northern fur seals are smaller than California sea lions, weighing 100 to 600 pounds depending on sex. They have dense, luxurious fur that ranges from dark brown to reddish, and their ears are small external flaps like sea lions. Their front flippers are proportionally shorter, making them less agile on land than California sea lions. Northern fur seals spend most of their lives at sea and rarely haul out in California, though they occasionally appear along the north coast in summer and fall. They are adapted to colder waters and migrate seasonally between breeding islands in the Bering Sea and feeding grounds in the North Pacific.

The California sea lion is by far the most abundant pinniped in California waters. You will see them at every major coastal attraction mentioned in the trunk page, from Monterey Bay to San Diego. They breed on islands off the California coast and haul out on rocks, docks, and beaches year-round. Steller sea lions are present but less common, concentrated north of Monterey Bay, particularly around the Farallon Islands and coastal rocks of Humboldt County. Northern fur seals are the rarest and are usually spotted only by chance rather than through deliberate whale watching or wildlife tours.

California sea lions eat fish and squid, diving to depths of up to 600 feet to hunt. Their primary prey includes anchovies, sardines, rockfish, and mackerel. They are agile hunters with excellent vision and hearing both in and out of water, allowing them to locate and catch fast-moving prey. A California sea lion can consume 5 to 10 pounds of food per day. Steller sea lions have similar diets but hunt slightly different fish species depending on regional availability. When you see sea lions hauled out, they are resting between foraging trips, not feeding.

California sea lions are exceptionally vocal animals, producing barks, growls, snorts, and whistles to communicate with each other on land and sometimes in water. Dominant males bark aggressively to establish territory and attract females. Mothers and pups exchange specific calls to recognize each other among hundreds of other animals. Underwater, sea lions use clicks and whistles to navigate and possibly communicate. Steller sea lions have deeper, more resonant calls. On a boat tour or shore visit, you will almost certainly hear sea lions before you see them, and the noise level at a large haul-out can be surprisingly loud.

California sea lions are present year-round along the California coast, though numbers and locations shift seasonally. Breeding season peaks from May through July, when males occupy territory and females come ashore to give birth and nurse. Non-breeding individuals disperse more widely in fall and winter. Steller sea lions are present primarily in northern California and are most visible in late fall through early spring when they haul out to rest. Northern fur seals are seasonal visitors, appearing most often from July through October when they migrate through California waters. Weather and ocean conditions influence visibility and hauling behavior on any given day.

California sea lion populations have recovered substantially since hunting was banned in 1972, and they are no longer considered endangered. However, they still face challenges from fishing net entanglement, ship strikes, and habitat loss. Climate change alters ocean temperature and prey availability, which can stress populations, especially during warm-water years when fish move northward. Steller sea lions are still listed as endangered, with smaller populations in Alaska and northern California. Human disturbance, including boats approaching hauling sites too closely, can disrupt resting animals and mothers nursing pups. Protected areas and marine sanctuaries help reduce these threats.

Sea lions have external ear flaps and long front flippers that rotate under their body, letting them walk and gallop on land almost like a four-legged animal. True seals, such as harbor seals and monk seals, lack external ears and have shorter flippers positioned along their sides, forcing them to move with a caterpillar-like bounce on land. Sea lions are generally more agile and vocal on land, while seals are more agile in water. Both are pinnipeds, or 'fin-footed' marine mammals. In California, the sea lions (California sea lion and Steller sea lion) are the species most people encounter on shore tours, while harbor seals are more solitary and often seen resting on rocks from a distance.