Known only by her research number, Grizzly 399 has been a fixture in Grand Teton National Park since 2007, becoming the world’s most famous grizzly bear. Now 399 is raising four new cubs in the face of human encroachment, a warming climate and the threat of losing protection under the Endangered Species Act. For more information and reminders about the premiere, text Grizzly to 20366.

Air Date: Wed, May 8, 2024 8:00 PM