0709 GMT October 17, 2021
It's a contest held every year which celebrates the furry residents living in Alaska's Katmai National Park and Preserve in the US.
People are given the opportunity to vote for which bear they think has put on the most weight as the animals get ready to hibernate during the winter, bbc.co.uk reported.
This competition runs from September 29 to October 5 this year, but there's also an additional twist – the organizers have expanded the contest to include a bracket for bear cubs!
The Fat Bear Junior competition will see audiences vote for their favorite bear cub on September 23-24 and the winner will go through to the famous adult contest where they'll compete for the top prize.
Four bears have been chosen to take part in this year's junior competition and each has made an impressive transformation in preparation for the colder months.
Meet the candidates – Spring Cub 132, Spring Cub 909, Yearling 128 and Yearling 435!