King Penguins Seem to Be Benefiting From a Warming World. While That’s Good News for Now, It Could Spell Trouble for the Future

The birds are breeding earlier, and more of their chicks are surviving. But researchers fear this success may not last

Sarah Kuta | Daily Correspondent

March 16, 2026

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As the planet heats up, king penguins appear to be thriving—at least for now.

The black-and-white birds are breeding earlier than two decades ago, and more of their chicks are surviving, researchers report in a new paper published March 11 in the journal Science Advances. But these climate change-driven advantages may be only temporary, experts warn, and they may come at the cost of other species.

“King penguins might be a winner for now, which is excellent news, but climate change is ongoing, and future changes to currents, precipitation or temperatures can undo these gains,” says Ignacio Juarez Martínez, a biologist at the University of Oxford in England who was not involved with the research, to Seth Borenstein of the Associated Press.

Standing roughly three feet tall and weighing about 20 to 30 pounds, king penguins are the world’s second-largest penguin species. These tuxedo-clad birds primarily breed on sub-Antarctic islands, forming massive colonies on ice-free swaths near the sea.

For the study, scientists focused on a colony on Possession Island, a French territory in the Crozet archipelago between Antarctica and Madagascar in the southern Indian Ocean. Here, scientists have been monitoring roughly 10,000 breeding pairs using radio-frequency identification technology since 1998.

In 2000, the birds started breeding around November 27, which is late spring in the Southern Hemisphere. By 2023, that date had shifted 19 days earlier to November 8, the researchers found. That corresponded with a greater proportion of their chicks surviving: an average of 62 percent in 2023, compared to 44 percent in 2000.

Scientists don’t know exactly what’s triggering this earlier start to the breeding period, though they suspect it’s a combination of factors like food availability, seasonal cues and weather conditions.

“One element is probably that king penguins breed when they feel strong and healthy, and when the weather gets them in the mood,” study co-author Robin Cristofari, an evolutionary biologist at the University of Helsinki in Finland, tells Amy Briggs of the Australian Broadcasting Corporation.

King penguins have an unusually long and flexible breeding season that extends from late October to March. As their habitat warms, the birds seem to be using this flexibility to their advantage.

Each breeding pair spends roughly two months incubating a single egg. Chicks hatch as helpless brown fluff balls that are totally reliant on their parents for survival. But adult penguins must temporarily leave their babies behind and often swim south to nab lanternfish, a small, abundant fish that feeds on plankton.

The earlier start to the breeding season gives the parents more time to fetch lanternfish and other food and gives the babies more time to fatten up before the arrival of winter. Meanwhile, rising ocean temperatures seem to be boosting lanternfish numbers. Together, these factors are leading to hardier, healthier chicks with better survival chances, the researchers say.

“As you can imagine, having three more weeks to put on fat before a full winter of fasting is a huge advantage [for chicks],” Cristofari tells ABC. “And if that next summer actually comes three weeks earlier too, then it’s a double advantage.”

Some scientists are optimistic about this development, which supports the notion that king penguins are flexible and resilient in the face of change. They see the study as a rare bright spot, as many other species, including emperor penguins, struggle to adapt.

“This is a good news story, and sure, things could change, but when we’re looking at other penguins, particularly, most of them as a whole family are in decline,” says Tom Hart, an ecologist at Oxford Brookes University in England who was not involved with the research, to New Scientist’s Alec Luhn. “This is a rare win.”

However, king penguins’ shifting breeding habits also demonstrate just how quickly the planet is changing. If global warming continues, they may not be able to keep pace in the long run.

Scientists are particularly concerned about how warming will ultimately affect king penguins’ foraging range. Right now, they primarily hunt lanternfish in a nutrient-rich area known as the “polar front.” If ocean temperatures continue to rise, scientists expect the polar front to drift farther south, meaning king penguins will have to travel farther to catch lanternfish. Parents will be expending more energy and may not be able to bring back as many fish to their chicks.

“For the moment, the species is able to cope with this change, but till when?” study co-author Céline Le Bohec, an ecologist at the French National Center for Scientific Research, tells the AP. “This, we don’t know, because it’s going very, very fast.”

But king penguins are not solely dependent on lanternfish. They also eat other types of food, such as squid, closer to home, and this dietary flexibility may give them an advantage if their environment continues to change. However, “winning for this species might mean losing for another species if they are competing for resources,” Casey Youngflesh, an ecologist at Clemson University who was not involved with the research, tells the AP.

King penguins are not the only species breeding earlier as the planet warms. A study published in January that examined 37 penguin colonies in the Antarctic Peninsula and sub-Antarctic islands found that the birds arrived at nesting sites nearly two weeks earlier during the 2021-2022 breeding season than they did in 2011-2012. Adélie and chinstrap penguins are now breeding ten days earlier, on average, while gentoo penguins are breeding an average of 13 days earlier.

Meanwhile, other penguins are struggling. Scientists predict emperor penguins will be mostly extinct by 2100, and they fear their demise may be hastened by their risky molting strategy. African penguins are critically endangered, grappling with issues like pollution and climate change in the coastal waters of South Africa and Namibia. Endangered Galápagos penguin numbers are also declining due to climate change, introduced predators, habitat loss and pollution, among other threats.

“Many penguins are living in ground zero areas for climate change,” Daniel Ksepka, a paleontologist and curator at the Bruce Museum in Connecticut, told National Geographic’s Rebecca Dzombak in 2022. “The fate of penguins is tied up in the fate of humanity, really.”

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Sarah Kuta is a writer and editor based in Longmont, Colorado. She covers history, science, travel, food and beverage, sustainability, economics and other topics.