Prehistoric mammals. Computer illustration of two Doedicurus sp. prehistoric mammals (lower left and right) and a giant ground sloth (Eremotherium sp.) grazing on grassy plains around 25,000 years ago, in what is now South America. Doedicurus were herbivorous glyptodonts that lived around 11000 years ago, from the Pleistocene epoch to the end of the last ice age. They reached a length of around 4 metres. Eremotherium lived in North and South America from around 4.9 million years ago - 11,000 years ago, during the Pleistocene epoch.