Here are some of the commonest clues to find, and when and where you might spot them… Soft mud, fresh snow and damp sand all ...

The footprints lie near another lake where the team recently uncovered a finger bone dating to some 90,000 years old that may also be H. sapiens. 3:52.

The 2009 discovery of footprints (human and animal) left behind in layers of clay and silt at New Mexico’s White Sands ...