Learn about the tracks and footprints at White Sands National Park in New Mexico, possibly representing the earliest evidence of human-made transportation technology.

And the White Sands footprints preserve a few moments of their early interactions. As Odess interprets them, one set of tracks shows “a giant ground sloth going along on four feet” when it ...

During the Ice Age, some mammals were particularly large. The giant sloth had adapted very well to the climatic conditions. The reason for its extinction was unclear for a long time - until ...