Ancient Ground Squirrels Consumed Megafauna Carcasses, DNA Study Reveals
A study of 700,000-year-old fossilized ground squirrel feces from Canada's Yukon territory reveals that ancient ground squirrels ate diverse diets including plants, insects, and carcasses of woolly mammoths, bison, and big cats. The research analyzed DNA from coprolites found in burrows exposed by gold-mining operations in the Klondike region. The findings provide new insights into Pleistocene ecosystems and document some of North America's oldest mammoth DNA.
Researchers analyzing fossilized feces from ancient ground squirrels discovered that these animals consumed a surprisingly diverse diet when they emerged from hibernation during the Pleistocene epoch. The coprolites, dated between 700,000 and 17,000 years old, contained mitochondrial DNA sequences from megafauna including woolly mammoths, bison, horses, and big cats, along with DNA from rodents, birds, invertebrates, and plants. The samples were recovered from ground squirrel burrows in Canada's Yukon territory that were exposed during gold-mining operations that melt permafrost deposits. Scientists believe the squirrels, which enter a hibernation-like state called torpor for up to eight months, emerged desperately hungry and scavenged available carcasses in their environment. The study also identified a previously unknown lineage of ground squirrel and potentially represents North America's oldest mammoth DNA on record.
What's missing
The articles do not discuss potential limitations of inferring diet from coprolite DNA, such as whether the DNA represents consumed food versus incidental ingestion, or how representative these samples are of broader ground squirrel populations across the Pleistocene.
How coverage differed
The Nature News article uses vivid language ('zombies of the Pleistocene') to make the findings engaging while maintaining scientific accuracy. The framing emphasizes the novelty of using coprolites as an ecological archive, which is a legitimate scientific advancement rather than sensationalism.
What different sources said
- Nature NewsCenter
Ancient ground squirrels feasted on carcasses like ‘zombies of the Pleistocene’
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