Why do salmon swim upstream to spawn?

Forget marathons, the salmon run is the most extreme sport on Earth! Witness the incredible athletic feat of salmon as they battle their way upstream. We're breaking down this brutal obstacle course, from fighting relentless currents and leaping up waterfalls to dodging a gauntlet of hungry predators. See why this intense endurance event is the ultimate test of strength and determination, all for the prize of starting the next generation.

Keywords: salmon obstacle course, extreme nature, animal athletes, survival of the fittest, wildlife competition, salmon facts, nature is brutal.

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Видео Why do salmon swim upstream to spawn? канала A Million Whys