A huge treasure trove of ancient DNA from animals including extinct woolly mammoths has been discovered in frozen squirrel feces in Canada's remote Yukon territory, scientists said Tuesday.

Contienen ADN antiguo de mamuts, bisontes, caballos y cientos de especies de plantas

A complex ecosystem of woolly mammoths, bison, horses and big cats has been elucidated by studying the faeces of small rodents that probably ate the bigger animals