Diprotodon Tracks, Australia

Photograph by Amy Toensing, National Geographic

On a drying lake bed in Victoria, a farmer in 2007 alerted scientists to a major find: well-preserved tracks of a Diprotodon. The slow-moving behemoth had been crossing a volcanic plain 100,000 years ago, when megafauna still walked tall.

See more photographs from the October 2010 feature story "Australia’s Lost Giants."