Those busy (and very not-picky!) squirrels! Archivists of nature!
"Who would have imagined that ground squirrel droppings preserved in Yukon permafrost could provide such detailed insights into ecosystems and evolutionary history stretching back hundreds of thousands of years? It is both scientifically important and genuinely fascinating."
https://www.cbc.ca/news/science/frozen-squirrel-poop-9.7230087

Frozen squirrel poop from Yukon is full of woolly mammoth, horse DNA | CBC News
Scientists have reconstructed genomes of woolly mammoths, horses, steppe bison and ground squirrels that roamed the grasslands of the Canadian Arctic as far back as 700,000 years ago using DNA found in frozen squirrel poop from the Yukon.






