30,000-year-old fur ball hidden in Canadian permafrost is actually a mummified squirrel

This lump of fur and claws is actually a balled-up mummified squirrel. (Image credit: Government of Yukon)

An unrecognizable ball of fur, claws and limbs that was recently unearthed in Canada is actually a mummified squirrel that likely died while it hibernated around 30,000 years ago, scientists reveal.  

The fur ball was discovered in 2018 by miners at Hester Creek in the Klondike gold fields in Canada’s Yukon territory. But scientists recently reevaluated it in preparation for its upcoming public debut at the Yukon Beringia Interpretive Center (YBIC) in Whitehorse, YBIC representatives wrote in a Facebook post (opens in new tab).

The lump is believed to be a curled-up Arctic ground squirrel (Urocitellus parryii). This species, which looks more like modern-day gophers than most squirrels, still exists today and lives in the region where the mummified ball was unearthed. Researchers have nicknamed the squirrel “Hester” after the area where it was found.    

“It’s amazing to think that this little guy was running around the Yukon several thousand years ago,” YBIC representatives wrote. The “incredible specimen” will soon go on display at the museum, they added.

Related: ‘Prehistoric’ mummified bear discovered in Siberian permafrost isn’t what we thought

A living Arctic ground squirrels (Urocitellus parryii) photographed in Canada’s Yukon territory. (Image credit: Shutterstock)

When researchers first found the balled-up squirrel it was not immediately obvious what it was. “It’s not quite recognizable until you see these little hands and these claws, and you see a little tail, and then you see ears,” Grant Zazula (opens in new tab), a paleontologist with the Yukon government that led the analysis of the squirrel, told CBC News (opens in new tab). When the researchers realized they had found a “perfectly preserved” squirrel they were very excited, he added.

The researchers believe that Hester was most likely hibernating when he died. Living Arctic ground squirrels curl up into balls like Hester to hibernate inside underground dens, which they often line with leafy nests. Researchers have found examples of these preserved nests, but they are almost always empty.   

An X-ray image of the mummified squirrel. (Image credit: Government of Yukon)

The researchers didn’t want to unravel the squirrel from its ball for fear that it may get damaged in the process, so it was X-rayed by local veterinarian Dr. Jess Heath to get a better sense of how well-preserved its insides were. 

Heath had predicted that the squirrel’s bones would likely have deteriorated as calcium leaked out over time, which would likely mean the interior of the ball was in poor condition. However, the X-ray scans revealed that the squirrel’s skeleton “was in great condition” and the creature appeared almost identical to a living Arctic ground squirrel , CBC News reported.

The Klondike gold fields is a hotspot for mummified animal discoveries. In June 2022, a perfectly preserved baby mammoth that also dates back to around 30,000 years ago was found there. And in 2016, a 57,000-year-old mummified wolf pup was unearthed in the region. 

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