Blue Juvenile Mastodon ToothThe American Mastodon was among the largest land animals that lived during the Pleistocene period (Ice Age ~2 million 11,500 years ago). During the Pleistocene period, its population was distributed throughout North America from coast to coast, beginning in Canada , and extending South past Florida, then into Central Mexico. Emerging in North Africa ~ 35 million years ago during the late Eocene period, Mastodons (Greek for "Nipple Tooth") migrated