Voting opens in Alaska's annual Fat Bear Week

Polls opened Tuesday in the only American election that really matters: Fat Bear Week.

While the United States might be gearing up for midterm ballots that will decide who runs Washington, hundreds of thousands of people were readying to vote on animals gorging themselves in rural Alaska.

In a contest that has rapidly become one of the internet's favorite moments, the brown bears of Katmai National Park unwittingly compete in a series of head-to-head contests to see which one of them has most impressively piled on the pounds ahead of hibernation.

Viewers can watch a livestream of the enormous animals as they scoop salmon from the Brooks River, or browse biographies of some of the top contenders, including before-and-after pictures showing how much weight the bears have gained over a summer of feasting.

"For each match-up, vote for the bear you believe best exemplifies fatness and success in brown bears," said organizers.

"The bear with the most votes advances to the next round. Only one will be crowned Fat Bear Week champion."

Last year's winner, Chunk, beat out a stiff challenge from two-time winner Grazer.

Summer and early autumn are key fueling periods for the brown bears, which will not eat for five months of hibernation, relying on their store of fat to survive the punishing Alaskan winter.

The online contest began in 2014 with just a few thousand people voting, but has now turned into an eagerly awaited exercise in tongue-in-cheek democracy with more than a million people voting every year.

The aim is to raise awareness of brown bears and their habitat in Alaska, and the risks they face from human activity.