Chris Johnson and Devin Hester challenge the cheetah in an extraordinary race of a lifetime.

Casey Anderson has rescued and raised a number of grizzlies in order to save their lives. After 25 years of diving deeper into “bear world” than most PhD’s ever have, Casey’s knowledge about grizzlies continues to grow. But … so have his questions about what’s really best for the bears ... and whether or not we’ve actually explored all of the options possible for orphaned cubs.

America's Greatest Animals takes us across North America on a revelatory mission: which of the continent's landmark creatures deserve to make the list?

On the outskirts of Yellowstone National Park is Paradise Valley, Montana, home to bears, wolves, elk, and an animal so secretive, few ever get to see it: the mountain lion. Wildlife filmmaker Casey Anderson became one of those lucky few after following the tracks of the elusive cat from his backyard into the world of a mother and her three cubs. It was the beginning of what would become a remarkable relationship that gave Casey a rare glimpse into the life of a mountain lion family and a new understanding of an animal we know so little about.

Once hunted to extinction, the California Grizzly survives only as a symbol, frozen on the state flag, waving over the land it once roamed. A century later, will California bring back its lost icon or leave it in myth?