Scientists have discovered a new species of gentoo penguin on the remote Kerguelen Islands, marking the first new penguin species identified in over a century. The research, led by an international team including scientists from Chile and the University of California, Berkeley, was published in the journal Communications Biology. The newly discovered species, called the southeastern gentoo penguin and scientifically named Pygoscelis kerguelensis, was found to be one of four distinct gentoo penguin species, previously thought to be a single species. This discovery was made using genetic analysis, which revealed significant differences between populations across the Southern Hemisphere. The study involved whole-genome sequencing of 64 penguins from 10 breeding colonies, covering most of the gentoo penguin’s geographic range. Researchers also compared physical traits such as coloration, vocalizations, breeding habits, and feeding behaviors to confirm the genetic findings. These analyses helped distinguish the new species from others and provided a more detailed understanding of how gentoo penguins have diversified over time. The newly identified species, along with others, may face uncertain futures due to climate change. Warming ocean temperatures could reduce suitable habitats for several island populations by 2050. Two of the other newly defined species, which live in the sub-Antarctic, may be especially vulnerable. In contrast, the southern gentoo penguin (Pygoscelis ellsworthi), which lives in Antarctica, may be less affected, as the continent’s colder conditions could remain stable for longer. The research team, including Juliana Vianna from Chile’s Andrés Bello National University, emphasized the need for international collaboration in conservation efforts. They noted that the newly identified species and other sub-Antarctic gentoo penguins are at the highest risk due to the potential loss of their habitats. The study also shed light on how gentoo penguins spread across the Southern Hemisphere, with their origins traced to Australia and New Zealand about 22 million years ago. The formation of the circumpolar current around 12 million years ago allowed them to colonize remote islands and even reach regions as far north as Africa and South America. Gentoo penguins have a flexible diet, which has played a key role in their ability to adapt and evolve into different species. Their ability to feed on a wide range of prey means they do not need to travel far from their colonies, allowing them to thrive in various environments. This adaptability has led to the emergence of four distinct species over the past 300,000 to 500,000 years. Genomic analysis led by Daly Noll, a graduate student at the University of Chile, revealed how each gentoo species has adapted genetically to its environment. For example, the southern gentoo has traits that help it survive extreme polar conditions, while the eastern gentoo has genes linked to efficient metabolism and strong diving abilities. The northern gentoo, found in South America, shows genetic traits related to digestion, heart function, and muscle activity. Using climate models, the team estimated that under a moderate warming scenario, island-dwelling sub-Antarctic gentoo penguins could lose all their current suitable habitats by 2050. Meanwhile, the Antarctic gentoo’s range might expand further inland. The study also highlighted the importance of whole-genome sequencing in understanding penguin adaptation and conservation. Researchers are now using these genetic insights to identify populations most at risk from diseases like avian influenza, helping to guide conservation efforts.