Ancient squirrel droppings reveal 700,000 years of lost ecosystems The Brighter Side of News Ground squirrel coprolites preserve complex archives of ancient environmental DNA over 700,000 years Nature Ancient Squirrels Ate Woolly Mammoth Meat. The Proof Is in the Poop. The New York Times Squirrel droppings yield a goldmine of prehistoric DNA The Globe and Mail B.C. researchers discover 'treasure trove' of Ice Age DNA in ancient squirrel droppings Vancouver Sun