Extras

    Video thumbnail: When Whales Walked: Journeys in Deep Time Crocodile Ancestors

    When Whales Walked: Journeys in Deep Time

    Crocodile Ancestors

    Scientists are now discovering the earliest ancient crocodiles.

    Crocodile Ancestors

    Video thumbnail: When Whales Walked: Journeys in Deep Time Birds Are Living Dinosaurs

    When Whales Walked: Journeys in Deep Time

    Birds Are Living Dinosaurs

    Birds have colonized every environment on Earth, so how did they come to be so diverse?

    Birds Are Living Dinosaurs

    Video thumbnail: When Whales Walked: Journeys in Deep Time Empire of Elephants

    When Whales Walked: Journeys in Deep Time

    Empire of Elephants

    Today there are three species of elephant, but 16 million years ago there were dozens.

    Empire of Elephants

    Video thumbnail: When Whales Walked: Journeys in Deep Time Walking Whale Ancestor

    When Whales Walked: Journeys in Deep Time

    Walking Whale Ancestor

    Blue whales are the biggest creatures ever. But how did they get so big?

    Walking Whale Ancestor

    Video thumbnail: When Whales Walked: Journeys in Deep Time When Whales Walked: Journeys in Deep Time | Teaser

    When Whales Walked: Journeys in Deep Time

    When Whales Walked: Journeys in Deep Time | Teaser

    Discover the evolutionary secrets of some of the world’s most majestic creatures.

    When Whales Walked: Journeys in Deep Time | Teaser

    Video thumbnail: When Whales Walked: Journeys in Deep Time When Whales Walked: Journeys in Deep Time | Trailer

    When Whales Walked: Journeys in Deep Time

    When Whales Walked: Journeys in Deep Time | Trailer

    Discover the evolutionary secrets of some of the world’s most majestic creatures.

    When Whales Walked: Journeys in Deep Time | Trailer

    Video thumbnail: When Whales Walked: Journeys in Deep Time When Whales Walked: Journeys in Deep Time | Preview

    When Whales Walked: Journeys in Deep Time

    When Whales Walked: Journeys in Deep Time | Preview

    Discover the evolutionary secrets of some of the world’s most majestic creatures.

    When Whales Walked: Journeys in Deep Time | Preview