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Frozen squirrel scat preserves ancient DNA from hundreds of species
A rich and complex ecosystem stretching back 700,000 years that included woolly mammoths, bison, horses and big cats has been unveiled thanks to DNA preserved in frozen faeces. Arctic ground squirrels (Urocitellus parryii) are rodents about 40 centimetres long, found in cold regions of both North America and Siberia. These areas were joined by a land bridge in the past, with the whole region being known as Beringia.
Ancient ground squirrel droppings reveal Arctic's rich evolutionary history
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