This undated photo provided by the National Park Service shows a human print inside a large sloth track at the White Sands National Monument in New Mexico. Researchers studying a trail of fossilized footprints on the New Mexico salt flat have determined the tracks tell the story of a group of Ice Age hunters stalking a giant sloth. "We see interesting circles of sloth tracks in these stalked trackways which we call 'flailing circles.' At White Sands, the scientists used an approach called relative dating to estimate a minimum age for the fossils. University of Arizona professor Vance Holliday (left) and doctoral student Brendan Fenerty work on the section of exposed lake deposits at New Mexico's White Sands National Monument.

Source: CBC News May 07, 2018 13:18 UTC