A team of scientists in Canada stumbled upon woolly mammoth DNA while digging through the fossilized feces of an Arctic ground squirrel. The discovery came not from a mammoth bone or tusk, but from a 30,000-year-old pile of rodent droppings preserved in the Yukon permafrost.
A prehistoric bathroom break yields a scientific first
Researchers from the Canadian Museum of Nature and the Yukon government were studying ancient ground squirrel burrows near the Klondike gold fields. They collected samples of what they call “midden,” the organic debris squirrels leave behind after hibernation. Inside one of these middens, they found fragments of DNA from a woolly mammoth, an animal that has been extinct for roughly 10,000 years.
How mammoth DNA ended up in a squirrel’s latrine
The scientists believe the mammoth DNA did not come from the squirrel itself. Instead, they think the ground squirrel gathered plant material from the landscape that had been contaminated by mammoth urine or feces. The squirrel then stored that material in its burrow, where it remained frozen and undisturbed for tens of thousands of years. The permafrost acted as a natural freezer, preserving the genetic material.
Local researchers and Yukon officials were intrigued because the find opens a new way to study Ice Age ecosystems. Normally, scientists rely on bones or teeth to extract ancient DNA. This discovery shows that even animal waste can hold clues about species that once roamed the region. The Yukon is already famous for its well-preserved Ice Age fossils, but this is the first time mammoth DNA has been recovered from a squirrel midden.
The team published their findings in the journal Quaternary Science Reviews. They note that the technique could help scientists map where woolly mammoths lived and what they ate, without needing to find their skeletons. For now, the discovery stands as a reminder that the smallest, most overlooked samples sometimes carry the biggest surprises.
