More than 30 million bison once roamed the Great Plains, but its population dwindled to 1,000 by 1900. Today, conservationists are working to restore populations of wild bison at wildlife centers such as the Neal Smith National Wildlife Refuge in Iowa. Watch Co-Host Peter Gros visit the refuge and learn about America's national mammal. | Mutual of Omaha's Wild Kingdom

Watch how a herd of European bison crosses a road in eastern Poland. Poland is home to Europe's largest land mammal—the majestic European bison (żubr). Thanks to decades of conservation, Poland's population hit a record 3,060 in 2025, with over 2,855 roaming free in forests like Białowieża & Bieszczady. From near-extinct to thriving! Credit: X@StapelAndrew | British Poles