Leopard Seal Antarctica: Facts, Diet & Where to See One

1. What Is a Leopard Seal?

A true seal built like a predator

The leopard seal is a "true" or earless seal, in the same family as the Weddell, crabeater, and Ross seals that share its range. It is the only member of its genus. The name comes from the dark spots on its silver-grey throat and chest, not from any relation to the big cat, though the comparison fits its lifestyle well enough.

It lives all the way around Antarctica, generally following the edge of the pack ice as it grows in winter and shrinks back in summer. Some individuals range much farther north than other Antarctic seals, turning up on sub-Antarctic islands like South Georgia and even along the coasts of New Zealand, Australia, South America, and South Africa. New Zealand now records enough visitors that researchers there keep a photo catalogue of individual seals identified by their spot patterns.

• Scientific name: Hydrurga leptonyx, roughly "slender-clawed water worker."
• Social life: Solitary. Adults come together mainly to mate, and mothers stay with pups for about four weeks.
• Natural predators: Only the orca, and even that is rarely recorded.
• Lifespan: Usually estimated at around 26 years in the wild, with records up to about 30.

2. Size, Build & That Reptilian Head

Bigger females, and a jaw that opens remarkably wide

Leopard seals are the second-largest seal in Antarctica after the southern elephant seal. Unusually for seals, the females are bigger than the males. A large female can outweigh an adult male by 150 kg or more.

The body is long and streamlined, with oversized front flippers that drive fast turns underwater. The head is the giveaway. It's broad, flat, and almost snake-like from above, with a jaw that can open far wider than you'd expect. Inside are long, curved canines at the front and, farther back, oddly shaped three-pointed cheek teeth that interlock when the mouth closes.

Those cheek teeth matter more than the canines. They work as a sieve, letting a leopard seal gulp a mouthful of seawater and push it back out while trapping krill inside. The same animal that can take down a penguin can also feed like a filter-feeding whale.

3. What Leopard Seals Eat

Mostly krill, which surprises almost everyone

The penguin-hunting reputation is earned, but it's only part of the menu. Across much of their range, krill and other small crustaceans generally make up close to half of what leopard seals eat. The rest shifts with location and season.

• Antarctic krill: The staple for many seals, especially younger animals still learning to hunt larger prey.
• Penguins: Gentoo, Adélie, and chinstrap penguins are the usual targets, with fledglings especially vulnerable when they first enter the water in late summer.
• Fish and squid: Taken opportunistically throughout the year.
• Other seals: Mainly young crabeater seals and fur seal pups. Many adult crabeater seals carry long parallel scars from leopard seal attacks they survived when young.
• Carrion: Whale carcasses are fair game when available.

That range is why the leopard seal is usually described as the Antarctic's apex seal. No other seal here regularly hunts warm-blooded animals.

4. How They Hunt Penguins

Patience at the ice edge, then speed

Leopard seals are ambush hunters. A common tactic is to wait just below the surface near a colony's landing spot, where penguins have to enter and leave the water. Penguins know this, which is why you'll often see a group bunch up on the shoreline, hesitating, until one jumps and the rest follow.

Once a seal catches a penguin, it often thrashes it hard against the water surface, sometimes over and over, to strip the skin and feathers before eating. It's loud, it's messy, and if it happens near your Zodiac, the expedition staff will usually hold position so everyone can watch. Most travelers find it more fascinating than grim. It's also a useful reminder that the penguin colonies you visit aren't a petting zoo.

The burst speed is what makes the ambush work. Leopard seals can reach about 40 km/h (25 mph) in short sprints, which is fast enough to close on a porpoising penguin in open water.

5. The Seal That Sings

Hours of structured song under the ice

During the Antarctic spring and summer breeding season, male leopard seals hang head-down in the water and sing. The calls are low trills, moans, and haunting descending tones, and they carry a long way underwater. Individual males have been recorded singing for as long as 13 hours.

A 2025 study led by researchers at the University of New South Wales analyzed recordings of 26 males in East Antarctica. It found that each male uses a small set of call types arranged into repeatable songs, with a level of predictability the team compared to human nursery rhymes. The likely message is simple: I'm big, I'm healthy, and I can keep this up all day.

You probably won't hear it from a ship. Some expedition vessels carry hydrophones, though, and if yours does, ask the naturalist team whether they'll drop one near a leopard seal. It's one of the strangest sounds in Antarctica.

6. Are Leopard Seals Dangerous to People?

Rarely, but they deserve real respect

For travelers on a standard expedition cruise, the practical risk is very low. There is one confirmed human death: in July 2003, British Antarctic Survey marine biologist Kirsty Brown, 28, was pulled underwater by a leopard seal while snorkeling near Rothera Research Station. It remains the only recorded fatality.

Other encounters have been far gentler. Wildlife photographers who have dived with leopard seals have described animals that circled, investigated, and in a few well-known cases repeatedly brought them penguins, possibly an attempt to feed a clumsy, hungry-looking creature. Leopard seals are curious, and curiosity in a 400 kg predator can look a lot like aggression.

• On landings: Your guides will keep you back from the water's edge if a leopard seal is nearby. Follow their lead without argument.
• In Zodiacs: Leopard seals occasionally investigate or even mouth the inflatable pontoons. Keep hands and cameras inside the boat.
• Kayaking and polar plunges: Operators generally pause these activities when a leopard seal is in the area. That's why.

7. Where and When to See One

Follow the ice and the penguins

Leopard seals aren't rare, but they are spread thin. Older estimates put the total population somewhere between 200,000 and 400,000, and the species is listed as Least Concern by the IUCN. The catch is that they live at low density across a huge area, so sightings are never guaranteed.

Your odds improve wherever sea ice and penguin colonies overlap. On the Antarctic Peninsula, expedition teams often find them hauled out on floes in the channels and bays around busy gentoo and Adélie colonies. Sites like Brown Bluff, Portal Point, and the ice-choked waters near Pléneau and Petermann Islands are commonly mentioned by guides. On South Georgia itineraries, they occasionally appear near large penguin colonies too.

• Best months: December through March. Late season (February–March) often brings more hunting activity, as penguin chicks start going to sea.
• Best vantage point: A Zodiac cruise among ice floes, rather than a shore landing.
• Best itineraries: Voyages that spend more days in the Peninsula's channels and pack ice, rather than prioritizing distance.

8. Watching and Photographing Them Well

Keep your distance and let the seal come to you

IAATO's visitor guidelines ask travelers to stay at least 5 meters (15 feet) from seals, and farther if an animal shows any sign of disturbance. Your Zodiac driver will handle distance on the water. Your job is to stay quiet and still.

• Lens: A 100–400mm zoom (or equivalent) covers most Zodiac sightings. Our guide to the best camera for Antarctica covers bodies and lenses in more detail.
• Binoculars: A good pair helps you spot a seal on a distant floe long before the naked eye does.
• The yawn shot: Resting seals yawn often. Pre-focus on the head and wait. That wide-open jaw is the classic leopard seal photo.
• Protect your gear: Zodiacs are wet. Keep a dry bag at your feet for the camera between sightings.