Sea Lions vs. Seals: How to Tell the Difference
Sea lions vs seals: a complete guide to the differences in ears, size, behavior, and sounds. See the easiest way to tell them apart and why sea lions bark while seals stay quiet, with underwater photos by William Drumm.
How to Tell the Difference Between a Sea Lion and a Seal
By William Drumm, underwater photographer and ocean ambassador
Sea lions and seals are easy to confuse, the fastest way to tell them apart is to look at the ears: sea lions have small visible ear flaps, seals do not. But there is more to it, this guide covers all the differences.
It was a warm morning and my first time diving in Monterey, and the ocean shimmered like glass. I was floating near a rocky outcrop, camera ready, when a sleek, whiskered face popped out of the water. For a moment, I thought I’d spotted a seal. Then it barked loudly and spun in a playful circle before darting away. I thought, “hmmm sea lion vs seal, how to tell the difference?”
It turned out that there was no seal. I had just met a California sea lion.
If you’ve ever stood on a pier or a beach and asked yourself, “Is that a seal or a sea lion?” you’re not alone. They both belong to the pinniped family, which means “fin-footed,” but they’re surprisingly different once you know what to look for.
The Difference Between Sea Lions and Seals
Sea Lion vs Seal Ears: The Easiest Way to Tell Them Apart
One of the easiest ways to tell them apart is by looking at their ears.
- Sea Lions: Tiny, visible ear flaps that stick out.
- Seals: No external ear flaps, just small holes on the sides of their heads.
Once you spot this difference, you’ll never mix them up again.
How Sea Lions and Seals Move on Land (and How Fast)
Sea lions and seals have very different personalities. Sea lions are the social ones. They gather in large noisy groups, lounge together in the sun, and often interact directly with divers, snorkelers, or curious boaters. Many people compare sea lions to dogs because of their playful temperament, expressive faces, and social barking. Seals are more solitary or stay in smaller groups. They are curious but usually keep their distance, observing more than interacting. The exception is babies. Both sea lion pups and seal pups are typically curious and are some of the most fun creatures to encounter underwater.
How Sea Lions and Seals Swim Differently
In the water, sea lions are like the acrobats of the ocean. They use their strong front flippers to power through the waves, almost like they’re flying underwater.
Seals take a different approach, they move by swaying their back flippers side-to-side, which makes them smooth, gliding swimmers.
Why Sea Lions Bark and Seals Stay Quiet
If you hear barking coming from the rocks, or even underwater, you are listening to a sea lion. Their vocal calls are loud, dog-like, and sometimes sound like an argument at the pier. Sea lions bark to communicate within the pod, defend territory, and alert each other to predators or threats. Seals, by contrast, are much quieter. They communicate mostly through low grunts, soft hisses, and snorts. If you can hear barking from a long distance, it is almost certainly a sea lion and not a seal. This is one of the most reliable ways to tell them apart from a distance.
Sea Lion vs Seal Personality and Temperament
Sea lions and seals have very different personalities. Sea lions are the social ones. They gather in large noisy groups, lounge together in the sun, and often interact directly with divers, snorkelers, or curious boaters. Many people compare sea lions to dogs because of their playful temperament, expressive faces, and social barking. Seals are more solitary or stay in smaller groups. They are curious but usually keep their distance, observing more than interacting. The exception is babies. Both sea lion pups and seal pups are typically curious and are some of the most fun creatures to encounter underwater.
Sea Lion vs Seal Size and Body Shape
Sea Lions: Sleek, long-bodied, with noticeable front flippers and visible ears. Adult male California sea lions can grow up to eight feet long and weigh around 800 pounds. Stellar sea lions can grow to 11 feet long and over 2,500 lbs, making them true ocean heavyweights.
Seals: More rounded bodies, shorter front flippers, and no visible ears. They’re generally smaller than sea lions, though elephant seals and leopard seals are a couple of the exceptions.
Bring the water home
What Sea Lions and Seals Eat
Both love seafood, but they hunt differently.
- Sea Lions: Agile hunters, often chasing fish in coordinated groups.
- Seals: Stealth hunters, relying on surprise and speed to catch prey like squid and fish.
Where Sea Lions and Seals Live
- Sea Lions: Often spotted on docks, piers, or sunny beaches along the Pacific coast. California sea lions are especially common from Alaska to Mexico. Other species of sea lion are found around the world, including Stellar sea lions along the west coast of the US and Canada, South American sea lions found from Brazil to Peru, Australian sea lions can be found mainly in South and Western Australia. There are also Galapagos sea lions, Japanese sea lions, and New Zealand sea lions.
- Seals: Seals are found in both the Northern and Southern Hemispheres, but they prefer quieter, less crowded shorelines or ice edges. There are 34 species of seals and are found in warm and arctic waters. There are even a couple of freshwater species of seals!
Quick Seal vs Sea Lion Comparison Chart
| Feature | Sea Lions | Seals |
|---|---|---|
| Ears | Visible ear flaps | No external ear flaps |
| Land Movement | Walk using all flipper | Belly slide |
| Swimming | Use front flippers | Use back flippers |
| Sound | Loud barking | Quiet grunts & hisses |
| Personality | Social & playful | Shy & reserved |
From the ocean to your inbox. Get new ocean stories, conservation updates, and behind-the-scenes photography from my expeditions, straight to your inbox.
Why Knowing the Difference Matters
Recognizing whether you’re looking at a sea lion or a seal isn’t just fun trivia, it helps you appreciate their unique adaptations and behaviors.
Next time you’re by the ocean, take a closer look. Are there ears? How are they moving? Are they barking or keeping quiet? Those little clues tell a bigger story about who they are and how they live.
Both sea lions and seals play important roles in the marine ecosystem, and both deserve our respect and protection. Whether you encounter the playful energy of a sea lion or the quiet grace of a seal, each will leave you with a memory worth keeping.
Frequently asked questions about sea lions and seals
Are seals or sea lions more dangerous?
Neither species is generally dangerous to humans, but sea lions are slightly more likely to be aggressive when defending territory or pups, especially male California sea lions during breeding season. Leopard seals (a true seal species) are the most potentially dangerous pinniped, with documented attacks on humans in Antarctica. For most divers and beachgoers, both groups are best observed from a respectful distance. Visit Are Sea Lions Dangerous to learn more.
Are seals like dogs?
Seals and sea lions are more closely related to bears and weasels than to dogs, but the resemblance is real. Pinnipeds and dogs share an ancient common ancestor, and they have similar facial features, body language, and curious personalities. Sea lions in particular often behave like wet dogs, complete with barking, head tilts, and playful energy. The genetic distance is significant, but the visual and behavioral similarities are why so many people make the comparison.
How fast can a sea lion run on land?
California sea lions can move up to 25 miles per hour on land in short bursts, which is faster than most humans can run. Their ability to rotate their hind flippers forward and walk on all fours gives them this surprising land speed. Seals, by comparison, are slow on land because they cannot rotate their back flippers, and they can only manage a clumsy belly slide of a few miles per hour at most.
Do sea lions bark?
Yes. Sea lions are famous for their loud, dog-like barks. They bark to communicate within the pod, defend territory, attract mates, and alert each other to threats. Their barking can be heard from a long distance and is one of the most reliable ways to identify them from a distance. Seals do not bark. They communicate using lower-volume grunts, hisses, and snorts.
Why do seals look like dogs?
Pinnipeds and dogs share a common ancestor that lived around 50 million years ago, before pinnipeds split off and adapted to life in the ocean. Both groups belong to the order Carnivora, which is why they share many facial features: forward-facing eyes, similar snouts, whiskers, and ear placement. Sea lions in particular share so many behaviors with dogs (barking, head tilts, playful curiosity) that the comparison feels obvious. They are essentially marine cousins of dogs.
What is the difference between a sea lion and a seal in temperament?
Sea lions are highly social and outgoing. They form large noisy groups, interact with divers and boaters, and seem to enjoy human attention. Seals are more reserved. They are still curious, but they tend to observe rather than approach, and they often stay in smaller groups or alone. If you encounter a pinniped that is barking and approaching boldly, it is almost certainly a sea lion. If you encounter one that is quietly watching from a distance, it is more likely to be a seal.
Are sea lions bigger than seals?
Generally yes, but with notable exceptions. Adult male California sea lions reach 800 pounds, and Steller sea lions can exceed 2,500 pounds. Most seal species are smaller than this, but elephant seals are the giants of the pinniped world: adult males can weigh over 8,000 pounds, far larger than any sea lion. Leopard seals are also large, reaching around 1,000 pounds. So while the average sea lion is bigger than the average seal, the very largest pinnipeds are seals, not sea lions.
Do sea lions and seals get along?
They generally coexist without conflict, but they do not interact much. Sea lions and seals occupy similar habitats in some regions, especially along the Pacific coast, but they do not form mixed groups. Each species sticks to its own social structure. In rare cases, sea lions have been documented preying on smaller seals, but this is not typical behavior.
Are seals and sea lions related?
Yes. Both belong to the pinniped group within the order Carnivora. Sea lions and fur seals are in the family Otariidae (eared seals). True seals are in the family Phocidae. They share a common pinniped ancestor that lived around 30 million years ago, and they evolved their aquatic lifestyle from land-dwelling carnivores related to bears and weasels.
Where can you see sea lions and seals in the wild?
Sea lions are commonly seen along the Pacific coast of North America, from Alaska to Mexico, with major populations in California (Pier 39 in San Francisco is famous), Oregon, and Baja California. They also live around the Galapagos, Australia, New Zealand, and South America. True seals have a wider range, from Arctic and Antarctic ice to temperate beaches around the world. Harbor seals are common along both U.S. coasts; gray seals are common in the North Atlantic; elephant seals haul out on California beaches at places like Año Nuevo and Piedras Blancas.
Sources and further reading
Share this story
Collect the ocean, not spam
New prints and expedition stories, about twice a month. First access to new releases.
