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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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When Whales Walked: Journeys in Deep Time

Walking Whale Ancestor

Blue whales are the biggest creatures to have ever lived on Earth. Measuring up to a hundred feet long and 200 tons in weight, they have a heart the size of a small car. But how did they get so big? Surprisingly, whales weren’t always gargantuan water-dwelling mammals. In fact, their ancestor Pakicetus, was the size of dog and walked on land.

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