WATCH: Fat Bear Week Annual Tournament Kicks Off

Some of the largest brown bears on Earth make their home at Brooks River in Katmai National Park, Alaska. Fat Bear Week is an annual tournament celebrating their success in preparation for winter hibernation.

Fat Bear Week is a single elimination tournament that runs from September 29th to October 5th.

Your vote decides which bear is the fattest of the fat. For each set of two bears, vote for the bear who you think is the fattest.

The bear with the most vote advances. Only one will be crowned champion of Fat Bear Week. Matchups will be open for voting between 10 a.m. and 9 p.m.

To look at some of the competitors and cast your vote, CLICK HERE.