Fall is here. Snow has fallen in the Rockies, the days are getting shorter, and some animals are realizing that winter isn't that far away.

With the change of seasons underway, you should mark your calendar for the most unusual competition in the National Park System and get started on your bracket. Not your NCAA basketball tournament bracket, but your fat bear bracket.

The week of October 5-11 at Katmai National Park and Preserve in Alaska officially is Fat Bear Week in the park, and the National Parks Traveler's Lynn Riddick caught up with Lian Law, Katmai's visual information specialist, to learn more about it.