Scientists name the first new penguin species in more than 100 years

A single, familiar-looking bird has turned out to be four separate species. Researchers led by UC Berkeley’s Rauri Bowie and the University of Chile’s Juliana Vianna and Elie Poulin have named a southeastern gentoo penguin, Pygoscelis kerguelensis, discovered breeding on the remote Kerguelen Islands. It is the first new penguin species named in more than 100 years.

The bird looks almost indistinguishable from the gentoo penguins already familiar from Antarctic wildlife documentaries, which is exactly why it went unrecognized for so long.

A Genome Survey That Doubled as a Detective Story

The team, whose work appeared in the journal Communications Biology and was later recapped by ScienceDaily, sequenced whole genomes from 64 penguins spread across 10 breeding colonies, examining thousands of single nucleotide polymorphisms to map genetic relationships across nearly the entire geographic range of gentoo penguins for the first time. Daly Noll, a graduate student at the University of Chile, served as the study’s first author on the international project, which drew collaborators from nine countries.

“There’s probably no species of penguin where the taxonomy has been more debated than the gentoo penguin,” Bowie said, describing decades of disagreement among ornithologists over whether gentoos across the Southern Ocean’s scattered islands represented one species or several. Earlier attempts to settle the question relied mostly on measurements of body size, bill shape and plumage markings, traits that vary enough within a single gentoo population that they never produced a conclusive split. Whole-genome sequencing sidestepped that problem entirely by comparing the birds’ DNA directly rather than arguing over how much a beak can vary before it counts as a different species.

Hidden 2,000 Miles From Anyone

The new species takes its scientific name from the Kerguelen Islands, an archipelago nicknamed the Desolation Islands that sits nearly 2,000 miles from any permanently inhabited landmass. Researchers describe it as a cryptic species, meaning it looks very similar to related gentoo populations despite carrying significant genetic differences that had gone undetected through more than a century of prior study.

That isolation is part of the explanation for why the split went unnoticed for so long. Gentoo penguins do not migrate across ocean basins the way some seabirds do, so populations separated by thousands of miles of open Southern Ocean rarely if ever interbreed, letting genetic differences accumulate quietly on islands that few researchers visit regularly. The genome data indicates the four lineages diverged from one another sometime in the past 300,000 to 500,000 years, long after gentoo penguins’ own ancestors first split off roughly 22 million years ago in the region around present-day Australia and New Zealand.

Four Species, Three Now Considered Threatened

Beyond the newly named southeastern gentoo penguin, the study formally splits the rest of the group into Pygoscelis taeniata on islands including Crozet, Marion and Macquarie; Pygoscelis papua around the Falkland Islands and Martillo Island; and Pygoscelis ellsworthi along the Antarctic Peninsula and South Georgia. Vianna said the reclassification carries direct consequences for how these birds are protected: “It’s very important that conservation institutions in all the different countries involved recognize and take appropriate action to save these three gentoo penguin species.”

Climate modeling cited alongside the study projects that three of the four species, all tied to sub-Antarctic islands rather than the Antarctic mainland itself, could lose suitable breeding habitat across their current island ranges by 2050. Only Pygoscelis ellsworthi, the Antarctic Peninsula lineage, is projected to be largely unaffected or possibly even favored by warming conditions in that particular region, a split outcome that complicates any single conservation strategy built around gentoo penguins as one uniform group.

The distinction is not just academic bookkeeping. Conservation status, fishing-quota decisions around penguin foraging grounds and international treaty protections for sub-Antarctic wildlife are all typically assigned species by species, so a population that used to be lumped in with millions of gentoo penguins worldwide can suddenly look far more vulnerable once it is counted on its own. A colony of a few thousand birds on one island chain carries very different conservation weight than a subspecies presumed to be part of a much larger, more secure global population.

Coverage from SciTechDaily and Greek Reporter both note that formally naming a new bird species is now a genomic exercise as much as a field one, since a bird that looks ordinary in every photograph can still turn out, on closer inspection of its DNA, to be something no one had a name for.

A fuller account of the research, including the museum specimens Bowie curates at UC Berkeley’s Museum of Vertebrate Zoology, is available through the university’s own account of the gentoo penguin split and a companion summary from Berkeley’s Office of the Vice Chancellor for Research. What remains unsettled is how quickly wildlife agencies on the various islands involved will update their own protected-species lists to reflect four penguins where field guides have listed one for generations.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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