'Unicorns' Lumbered Across Siberia 29,000 Years Ago

Large, four-legged beasts, each with a single horn growing from its head, once ambled across part of western Siberia, in what is now Kazakhstan. Sometimes referred to as "unicorns" because of their single horns, these animals were originally thought to have gone extinct 350,000 years ago. A 1923 publication by paleontologist Henry Fairfield Osborn estimated the creatures to be larger than any of the modern rhino species.