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  • 2004-08-04T23:00:00Z on BBC One
  • 30m
  • United Kingdom
  • French
  • Documentary
Every year 300 million salmon return to the Alaskan river where they were born, but they are swimming into a trap. The upstream waterfalls are preyed upon by grizzly bears and bald eagles. How do the salmon survive the onslaught?
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