Yes, sea lions do eat penguins, though it’s not a major part of their diet. Sea lions are primarily fish eaters, but several species have been documented hunting and killing penguins in the wild, both in the water and on land. This behavior has been observed across the Southern Hemisphere, from the Falkland Islands to New Zealand to southern Australia.
Which Sea Lions Eat Penguins
Multiple species of sea lions and fur seals (their close relatives) prey on penguins. South American sea lions have been observed attacking and killing rockhopper and gentoo penguins in Argentina, Chile, and the Falkland Islands. New Zealand sea lions prey on yellow-eyed penguins along the coast of New Zealand’s South Island. In the Galápagos Islands, sea lions are listed among the predators of the endangered Galápagos penguin. Long-nosed fur seals in Australia regularly eat little penguins, with penguin remains showing up in anywhere from 0% to 40% of their droppings depending on location. Antarctic fur seals have been documented preying on king penguins onshore.
Despite this range of species, penguins remain a small fraction of what sea lions eat overall. Fish and squid make up the bulk of their diet. Penguin predation is better described as opportunistic: sea lions that share habitat with penguin colonies sometimes take advantage of the easy meal, but they aren’t specialized penguin hunters the way leopard seals are.
How Sea Lions Hunt Penguins
Sea lions use ambush tactics, typically lurking in the shallow surf near penguin colonies. One well-documented case from New Island in the Falklands captures the typical approach: a South American sea lion patrolled the waves just offshore, waiting for penguins entering or leaving the water. When it spotted an opportunity, it exploded out of the surf toward its target. The penguins, clearly aware of the threat, raced toward the beach to escape. In one attempt, the sea lion caught a penguin heading into the water, dragged it to deeper water, and consumed it there. In another, it trapped a lone Magellanic penguin on the beach, pinned it, grabbed it by the flipper, and hauled it back out to sea.
This combination of water and land hunting sets sea lions apart from leopard seals, which almost exclusively ambush penguins underwater. Leopard seals hover beneath ice edges, waiting for penguins to dive in. Sea lions are more versatile, chasing penguins through the surf zone and sometimes pursuing them right up onto the beach.
Not All Individuals Hunt Penguins
One of the more surprising findings is that penguin predation often comes down to specific individuals rather than whole populations of sea lions. At Otago Peninsula in New Zealand, researchers found that female New Zealand sea lions killed 20 to 30 yellow-eyed penguins per year, while males didn’t eat them at all. Even more striking, a single female may have been responsible for most of the kills.
A similar pattern appears in Australian waters. Researchers studying long-nosed fur seals across Bass Strait identified seven hotspots where penguin remains appeared in more than 30% of seal droppings. But at other sites, penguins barely registered in the diet. The variation suggests that certain individuals or local groups develop a taste for penguins while others in the same species never do.
The Conservation Problem
For most penguin populations, sea lion predation is a minor concern compared to threats like habitat loss, fishing nets, and climate change. But for small, isolated colonies, even modest predation can be devastating. The clearest example is at Otago Peninsula, where New Zealand sea lions threaten the viability of yellow-eyed penguins. Both species are threatened, which creates an unusual conservation dilemma.
Otago Peninsula holds the largest population of yellow-eyed penguins on New Zealand’s South Island and the only mainland breeding colony of New Zealand sea lions. Population modeling showed that colonies averaging 25 nests per year could sustain only 4 to 5 penguin kills annually before risking collapse. At a rate of 20 kills per year, these small colonies went extinct in simulations within five years. The situation forces conservationists to choose: do nothing and risk losing the penguin population, or intervene against the sea lions and potentially undermine their recolonization of the mainland.
At Campbell Island, south of New Zealand, sea lion predation on yellow-eyed penguins was considered a probable cause of declining penguin numbers there as well.
Sea Lions vs. Leopard Seals as Penguin Predators
People often confuse sea lions with leopard seals when it comes to penguin predation, and the distinction matters. Leopard seals are the primary seal predator of penguins, particularly in Antarctic waters. They specialize in hunting penguins, with emperor penguins being a key target. Their preferred method is pure ambush: waiting motionless at the water’s edge for penguins to jump in, with a particular focus on inexperienced juveniles entering the ocean for the first time.
Sea lions, by contrast, are generalist predators that occasionally eat penguins when the opportunity arises. They hunt more actively, chasing penguins through waves and onto beaches rather than lying in wait. The frequency is also different. Leopard seals systematically target penguin colonies during breeding season when birds are most abundant. Sea lions take penguins sporadically, and in most populations the behavior is limited to a handful of individuals. If you’ve seen dramatic footage of a seal catching a penguin in Antarctica, you almost certainly watched a leopard seal, not a sea lion.