TRANSCRIPT
    - [Narrator] The land may freeze    over, but the sea doesn't.   
    Herring, they come to    wait out the winter months       in huge numbers,    and hunters follow.   
    Orca, the wolves of the sea.   
    Winter's return marks the    start of a great feast.   
    They follow the herring    into shallow waters.   
    And with so many fish around,       picking them off is easy    for a pod that knows how.   
    Orcas here have a special    way of catching herring.   
    A quick turn of speed       and their powerful tails send    shockwaves through the water,       stunning the fish.   
    Shoals this big make    it hard to miss.   
    (birds cawing)       It's not just orcas that    take advantage of the feast.   
    Humpback whales.   
    They can swallow hundreds of    fish in single, giant mouthful.   
    With billions of    herring gathered here,       this spectacle will last    all through the long winter.