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Episode 5: The Calling

The Calling

Season 4 Episode 5
53:05
When Whales Could Walk

When Whales Could Walk

Season 51 Episode 1
53:31
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Big Blue Live

A Blue Whale Sighting

On the Sunday, Aug. 30th episode Big Blue Live, UK viewers were treated to the largest animal on Earth, the blue whale, when it was spotted via helicopter and tracked live for the first time in history. Big Blue Live premieres on PBS Monday, August 31.

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