Researchers studying eroding permafrost in the Yukon found that fossilized squirrel feces act as accidental archives of Ice Age biological material [1].
These findings provide a rare, concentrated glimpse into ancient ecosystems. By analyzing the contents of the droppings, scientists can reconstruct the types of vegetation and animals that existed in northern Canada long before modern records.
The preserved material consists of bits of plants, seeds, and bones [1]. These organic fragments were inadvertently stored in squirrel burrows and became trapped in the permafrost. The process of thawing and refreezing the ground served to seal these biological records for millennia.
According to the study, the material found in these fossilized samples dates from roughly 17,000 to 700,000 years ago [1]. This vast temporal range allows researchers to track how the environment shifted over hundreds of thousands of years.
The discovery highlights the role of small mammals in creating paleontological records. While larger fossils often provide a skeletal outline of the past, the dietary remains found in squirrel feces offer specific data on the flora, and micro-fauna of the region [1].
Scientists are continuing to examine these sites in the Yukon to determine how ancient plant species adapted to the extreme cold of the Ice Age. The eroding permafrost is currently making these archives more accessible to researchers, though it also puts the samples at risk of degradation if not recovered quickly.
“Fossilized squirrel feces act as accidental archives of Ice Age biological material.”
The use of coprolites—fossilized feces—allows scientists to bypass the gaps often found in the traditional fossil record. Because squirrels collect a variety of seeds and organic matter, their burrows function as time capsules that preserve a broader spectrum of biodiversity than skeletal remains alone, providing critical data on prehistoric climate change and botanical evolution.
