The High Arctic, a region often perceived as a barren landscape, is yielding remarkable insights into prehistoric life. A team of paleontologists from the Canadian Museum of Nature has announced the discovery of a remarkably well-preserved rhinoceros skeleton, Epiaceratherium itjilik, that roamed Canada’s Arctic islands approximately 23 million years ago. This “frosty rhino,” as it’s been nicknamed, is the northernmost rhino species ever found, challenging previous understandings of mammal distribution and migration patterns.
The discovery, made within the Haughton Crater on Devon Island, Nunavut, isn’t just about adding another species to the fossil record. It suggests that land mammals were able to traverse the North Atlantic via land bridges far more recently than previously believed, potentially reshaping our understanding of ancient ecosystems and biogeography. The remarkably complete skeleton – roughly 75% of the animal was recovered – provides a rare glimpse into a time when the Arctic was a vastly different environment.
A Rhino Adapted to the Arctic
Epiaceratherium itjilik was a unique rhino, adapted to a cooler climate. Unlike its modern African and Asian cousins, this ancient species was smaller and slimmer, lacking the prominent horn seen in many extant rhinoceroses. Its build more closely resembled that of the Indian rhinoceros, according to researchers at the Canadian Museum of Nature. The name “itjilik” itself reflects this Arctic connection, meaning “frost” in Inuktitut, and was chosen in consultation with Inuit Elder Jarloo Kiguktak from Grise Fiord, recognizing the region’s cultural heritage.
The initial discovery of key bones – parts of the skull, jaws, and teeth – dates back to 1986, when Dr. Mary Dawson of the Carnegie Museum of Natural History first collected the specimens. Dr. Dawson, a pioneer in Arctic paleontology who passed away in 2020, is listed as a co-author on the study formally describing the species, published in Nature Ecology & Evolution. The exceptional condition of the fossil, with bones that are three-dimensionally preserved and only partially mineralized, has allowed for detailed analysis.
Rewriting the History of Mammalian Migration
The location of the Epiaceratherium itjilik fossil is particularly significant. By analyzing 57 extinct and living rhino species, Dr. Danielle Fraser, head of palaeobiology at the Canadian Museum of Nature, and her team determined that this Arctic rhino likely migrated to North America from Europe via a land bridge through Greenland. Previous research suggested this North Atlantic Land Bridge disappeared around 56 million years ago, but the new evidence indicates it remained viable much longer, potentially until the Miocene epoch. This finding challenges long-held assumptions about the timing and routes of mammalian dispersal.
“Our reconstructions of rhino evolution reveal that the North Atlantic played a much more critical role in their evolution than previously thought,” Dr. Fraser stated. The team’s modeling supports the existence of this land bridge during the period Epiaceratherium itjilik inhabited the Arctic, opening up new avenues for understanding how mammals populated North America.
Adding to the breakthrough, scientists at the University of Copenhagen, led by postdoctoral fellow Ryan Sinclair Paterson, successfully extracted partial proteins from the rhino’s tooth enamel in 2025. This achievement, detailed in the Nature Ecology & Evolution publication, extends the timeline for recoverable evolutionary proteins by millions of years and provides a new tool for studying ancient mammals at the molecular level.
A Glimpse into the Ancient Arctic Environment
The Haughton Crater, a 23-kilometer-wide impact crater, wasn’t always the icy landscape This proves today. Fossil evidence reveals that millions of years ago, the area was home to lakes and temperate forests, with birch and larch trees thriving where ice now dominates. The process of cryoturbation – the freezing and thawing of the ground – has helped to expose and preserve fossils like Epiaceratherium itjilik over a roughly seven-square-meter area.
This discovery builds on previous work at the Haughton Crater, where researchers, including Dr. Natalia Rybczynski, previously uncovered Puijila darwini, a transitional seal ancestor, connecting the stories of life adapting to both ice and continental dispersal. The Canadian Museum of Nature continues to study the fossils recovered from this unique Arctic hotspot, offering a window into a past world.
The fossil of Epiaceratherium itjilik is now housed at the Canadian Museum of Nature, in collaboration with the Carnegie Museum of Natural History. Further research promises to unlock even more secrets about this “frosty rhino” and the ancient Arctic environment it once called home.
The ongoing research at sites like Haughton Crater underscores the Arctic’s potential to reveal further chapters in Earth’s history. As climate change continues to reshape the Arctic landscape, the preservation and study of these fossils become increasingly critical for understanding the planet’s past and informing its future.
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