A spectacular fossil graveyard reveals a 43-million-year-old whale that had four legs and could walk. Follow scientists as they search for new clues to how mammals moved from land into the sea to become the largest animals on Earth.
Duration: 56 minutes and 46 seconds
Episode Number: 5101
| Wed, May 20 | 9:00 P.M. | When Whales Could Walk NHPBS (11.1) |
| Thu, May 21 | 1:00 A.M. | When Whales Could Walk NHPBS (11.1) |
| Fri, May 22 | 3:00 P.M. | When Whales Could Walk NHPBS (11.1) |
| Sat, May 23 | 1:00 P.M. | When Whales Could Walk NH Explore (11.2) |
| Sun, May 24 | 12:00 A.M. | When Whales Could Walk NHPBS (11.1) |
| Sun, May 24 | 4:00 A.M. | When Whales Could Walk NH Explore (11.2) |
| Sun, May 24 | 7:00 A.M. | When Whales Could Walk NHPBS (11.1) |
| Sun, May 24 | 8:00 P.M. | When Whales Could Walk NH Explore (11.2) |
| Mon, May 25 | 12:00 A.M. | When Whales Could Walk NH Explore (11.2) |
| Tue, May 26 | 7:00 P.M. | When Whales Could Walk NH World (11.3) |
| Wed, May 27 | 12:00 A.M. | When Whales Could Walk NH World (11.3) |
| Wed, May 27 | 8:00 A.M. | When Whales Could Walk NH World (11.3) |
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