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Watch Wild online: Episode 77 Icy Killers: Secrets Of Alaska's Salmon Shark

Once a year, one of natures great spectacles takes place on the northernmost coast of the Gulf of Alaska. It is a predestined collision of two massive migrations - a David and Goliath event - when thousands of ravenous salmon sharks gather to attack millions of Pacific salmon. The salmon are desperately trying to reach their spawning grounds in Prince William Sound. The sharks are there to gorge themselves. But sharks? In Alaska? Of the roughly 400 known shark species in the world, this is one of the few equipped to ply these icy waters. In the end, the salmon run on an urgency born of their need to reproduce while the sharks run onhunger. This one-hour spectacular travels with the salmon shark and the salmon in the most revealing portrait ever of this rarely filmed, little-known shark: Alaskas Icy Killer.

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