Two-million-year-old DNA found in frozen soil has been sequenced, revealing a surprising picture of an ancient landscape. Extinct creatures including, unexpectedly, elephant-like mastadons turn out to be among the beasts roaming Greenland. Researcher Eske Willerslev explains how DNA found in the environment can be used to reconstruct the past as so-called 'eDNA' becomes a vital tool for palaeontologists.

Read the paper: A 2-million-year-old ecosystem in Greenland uncovered by environmental DNA