The US National Park Service is currently streaming a number of webcams showing bears catching salmon swimming upsteam in Katmai National Park, Alaska. The park service is streaming footage from the Brooks river area, in partnership with explore.org.

The park service says the streams will show the dominant bears trying to get the best positions by the falls, where salmon leap to continue upstream. It also hopes to get people talking about it with people being able to use the hashtag #bearcam.

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What the camera is capturing is a natural phenomenon known as the salmon run. The fish swim upstream to spawn (release eggs), often with an incredible ability to find themselves back at their birth streams from the sea.

The annual upstream struggle is a tough test for the salmon and, though most spawning will die, many already perish on the way thanks to predators who lie in wait on route. As well as bears, bald eagles, seals and otters also pose threats.

The majority of salmon runs take place in the fall, with some species migrating at other times of the year.