Whale scientist Nan Hauser describes how she believes a humpback whale saved her from a shark, and what happened when the same whale came back.

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Close Encounters: Birth of a Colony
Being saved by a whale, finding an extinct frog, and how one penguin founded an entire colony. In this series, you will hear how some of these animal encounters have changed people's lives forever.

Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of entertaining and thought-provoking natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this.

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