Explore a world before dinosaurs and swim with ancient underwater creatures Did you know that Tanystropheus had a neck longer than its whole body? Or that Odobenocetops had tusks like a walrus? Millions of years before dinosaurs roamed the land, all of Earth's creatures lived in the water. Every creature on land today--even humans--originally evolved from prehistoric fish From spiral-shelled Ammonites to Shastasurus, the...