This award-winning production takes viewers back in time to the changing landscapes and amazing animal life of America's Great Plains over 30 million years ago. The film brings this extraordinary period to life through profiles of paleontologists, footage of modern-day excavations, and stunning 3-D visualizations of long-extinct creatures that once roamed the American heartland.

This award-winning production takes viewers back in time to the changing landscapes and amazing animal life of America's Great Plains over 30 million years ago. The film brings this extraordinary period to life through profiles of paleontologists, footage of modern-day excavations, and stunning 3-D visualizations of long-extinct creatures that once roamed the American heartland.