The American mastodon thundered through the Ice Age. With its powerful tusks and large size, few predators challenged this prehistoric beast. Go back in time and learn all about this mighty plant eater.

Animal file -- Ancient elephants? -- Mistaken for a mammoth -- Mighty molars -- Tough tusks -- Layers of hair -- Following the footprints -- Pleistocene home -- Stronger together -- A saber-toothed supper -- Early hunters -- First fossil discoveries -- American mastodons on display.