Fat Bear Week is hosted by the state of Alaska. It is an annual celebration of the success of brown bears in Katmai National Park and Preserve, where they load up on salmon ahead of hibernation. The event is held over the course of seven days and concludes on Fat Bear Tuesday, where people vote for their favorite bear in a March Madness-style bracket competition. The bears with the most votes at the end of each day advance to the next round until a champion is crowned. The event has become a tradition since its humble beginnings as Fat Bear Tuesday in 2014.