S Revisited (2): Great Barrier Reef

It's the world’s largest expanse of coral reefs. It is home to an astonishing diversity of life and vital to the health of our seas. But this extraordinary place and all the life it supports is under threat like never before. A team of scientists have based themselves on Heron Island, at the southern tip of the reef, to monitor green turtles, follow families of breeding birds and meet the reef’s curious residents.

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S01E10 - Planet Earth: A Celebration