Every year, sockeye salmon swim upstream in Alaska's Brooks River in Katmai National Park. And every year, the brown bears of the park flock to a mile-long stretch to dine upon this fishy feast.

There are approximately 2,200 bears currently living in the park. At the start of this yearly aquatic buffet, the bears will gobble down the entire fish. After a few days, the bears will eat only the fattiest parts of the fish: brain, skin, eggs and tail. There is such a glut of fish that the bears can afford to be picky and only dine on the richest parts of their prey. The fishy remains are left for other animals in the park.

You can watch live footage of this annual wonder from Explore Bears below. Explore Bears suggest the best time to view the bears fishing is between 5 a.m. and 12 a.m. Alaska Daylight Time (between 2 p.m. and 9 p.m. BST).