California sea lion hauled out on shore.

About The Species

California sea lions are “eared seals” native to the West Coast of North America. They live in coastal waters and on beaches, docks, buoys, and jetties. They are easily trained and intelligent and are commonly seen in zoos and aquariums. California sea lions are playful, intelligent, and very vocal (sounding like barking dogs).

Like all marine mammals, they are protected under the Marine Mammal Protection Act. Their population has been increasing since at least 1975, after protections were put in place under the MMPA.

NOAA Fisheries helps conserve the California sea lion through collaborative management, integrated science, partnerships, and outreach. Our scientists use innovative techniques to study, protect, and rescue California sea lions in distress—for example, stranded or caught in nets. Our work helps reduce harm from human activities (such as fishing and pollution) through management based on sound science, public input, and public outreach.

Status

NOAA Fisheries estimates population size for the U.S. stock of California sea lions in our stock assessment report. The U.S. stock of California sea lions has grown by 6.2 percent, on average, since 1983.

MMPA Protected

throughout its range

Appearance

Adult females and juveniles are slender-bodied and are blonde to tan in color. Adult males are generally larger than females and are mostly dark brown to black in color. Pups are dark brown at birth and weigh about 16 pounds. When pups are 4 to 5 months old, they molt their dark brown coats for light brown or silver coats.

California sea lions have broad front flippers and long, narrow snouts. Subadult and adult males have pronounced forehead crests crowned with tufts of blonde or lighter hair. California sea lions have visible ear flaps, and three to five claws on their hind flippers.

Behavior and Diet

California sea lions feed mainly offshore in coastal areas. They eat a variety of prey—such as squid, anchovies, mackerel, rockfish, and sardines—found in upwelling areas. They also may take fish from commercial fishing gear, sport fishing lines, and fish passage facilities at dams and rivers.

California sea lions are very social on land and in the water, but during the breeding season the males aggressively defend their territories and females fight other females to protect their pups. While on the breeding islands, California sea lions are very skittish of humans and will run into the water if they see or smell people.

California sea lion males bark like dogs to communicate with other males and females. Females and pups communicate using vocalizations that are unique to the female and pup. Each pup and female has a unique scent that also identifies them. A female can locate her pup among hundreds of others by her pup’s vocalization. When she finds her pup, she smells it as a final check.

One common behavior—called “rafting”—can make a sea lion look like it’s caught in a net. A rafting sea lion holds its flippers above the water for a long time, motionless, to rest and regulate its body temperature. If you cannot see a buoy or net gear, the seal is most likely rafting.

Location Description
California sea lions live in the shallow waters of the eastern North Pacific Ocean. They prefer sandy beaches or rocky coves for breeding and haul-out sites. Along the West Coast, they also haul out on marina docks as well as jetties and buoys.
California sea lions range from southeast Alaska to the Pacific coast of central Mexico. Their primary breeding range is from the Channel Islands in southern California to central Mexico. NOAA Fisheries divides the California sea lion population into three stocks (United States, western Baja California, and Gulf of California) based on the location of major rookeries and the international border. The U.S. stock waters ranges from the U.S./Mexico border to Canada.
In normal years, male California sea lions migrate during the winter to feeding areas off California, Oregon, Washington, British Columbia, Canada, and southeast Alaska but females and pups stay near the breeding colonies until the pups are weaned. In warm water (El Niño) years, some females are found as far north as Washington and Oregon, presumably following prey.
California sea lion range map.
Lifespan and Reproduction

Males are "polygamous," establishing breeding territories that may include up to 14 females. They defend their territories with aggressive physical displays and vocalization. Sea lions reach sexual maturity at 4 to 5 years old, but do not become socially mature until much older—they begin holding territories at around 9 to 12 years old. Breeding season lasts from late June to early August; most pups are born from May through June. Three to four weeks after giving birth, females are ready to mate again.

California sea lions separate their nursing and feeding activities. A mother sea lion nurses her pup for 1 to 2 days, then leaves the pup ashore while she travels to feeding areas at sea. She spends 2 to 5 days feeding, then returns to nurse. During the mother's absence, the pup doesn’t eat. Females continue a pattern of going to sea for several days and nursing ashore for several days until they wean their pups. This takes almost a year. If you see a pup on the shore, please leave it be. If it looks to be in distress, call your local marine mammal stranding network member.

Threats

Entanglement

One of the main threats to California sea lions is getting caught in fishing gear. They can become entangled in many different gear types, including traps, pots, or gillnets. Once entangled, they may drag and swim with attached gear for long distances, ultimately resulting in fatigue, compromised feeding ability, or severe injury, which may lead to reduced reproductive success and death.

Biotoxins from Harmful Algal Blooms

Under the right conditions, algae can grow out of control. Some algae “blooms” produce toxins that can kill fish, mammals, and birds, and may sicken or even kill humans in extreme cases. California sea lions are top predators, which means these toxins can build up in their bodies, possibly leading to seizures or death from domoic acid poisoning.

Human-Caused Injuries

California sea lions are easy to view in the wild, but this puts them at higher risk of human-related injuries and death. Feeding or trying to feed them is harmful and illegal, because it changes their natural behaviors and makes them less wary of people and vessels. They learn to associate humans with an easy meal and change their natural hunting practices—for example, they take bait catch directly off fishing gear. Sometimes they fall victim to retaliation (such as shooting) by frustrated boaters and fishermen.

They may also be disturbed or harassed by the presence of humans and watercraft. Harassment happens when any act of pursuit, torment, or annoyance might injure them or disrupt their behaviors—and it’s illegal. Remember to share the shore with California sea lions, for their safety and yours.

Scientific Classification

Kingdom
Animalia
Phylum
Chordata
Class
Mammalia
Order
Carnivora
Family
Otariidae
Genus
Zalophus
Species
californianus

What We Do

Conservation & Management

All California sea lions are protected under the MMPA. Our work supports protection and conservation by:

  • Reducing interactions with commercial fishing gear.
  • Minimizing harassment and illegal feeding.
  • Responding to dead, injured, or entangled sea lions.
  • Encouraging responsible viewing of wild sea lions.
  • Minimizing the effects of vessel disturbance and other types of human impacts.

Science Behind the Scenes

Our research has found new aspects of California sea lion biology, behavior, and ecology and helped us understand the challenges that sea lions face. It is especially important in conservation and management—as the population recovers, more sea lions come into contact with people and other protected resources.

Our research includes:

  • Assessing abundance, survival, and birth rates and how they change over time as the population grows.
  • Monitoring food habits and foraging ecology to understand the role of sea lions in the coastal and offshore marine ecosystem under different environmental conditions.
  • Describing disease ecology and human sources of death and the role they play in the population’s health.

How You Can Help

Keep Your Distance

Be responsible when viewing marine life in the wild. Observe all seals and sea lions from a safe distance of at least 50 yards and limit your time spent observing to 30 minutes or less.

Learn more about our marine life viewing guidelines >

Marine Life In Distress

Report Marine Life in Distress

Report a sick, injured, entangled, stranded, or dead animal to make sure professional responders and scientists know about it and can take appropriate action. Numerous organizations around the country are trained and ready to respond.

Learn who you should contact when you encounter a stranded or injured marine animal >

Report a Violation

Report a Violation

Call the NOAA Fisheries Enforcement Hotline at (800) 853-1964 to report a federal marine resource violation. This hotline is available 24 hours a day, 7 days week for anyone in the United States.

You may also contact your closest NOAA Office of Law Enforcement field office during regular business hours.