1. Video content

    Video caption: Saving Australian frog species on the brink of extinction

    Scientists say urgent action can prevent extinctions, but fear four species to be already lost.

  2. Virtually extinct butterfly breeding again on Portland after absence of more than half a century

    Video content

    Video caption: Large tortoiseshell butterfly disappeared from UK in the sixties.
  3. Video content

    Video caption: Galápagos tortoise found alive is from a species thought extinct since 1906

    Genetic tests on a giant Galápagos tortoise have confirmed it is from a species once thought extinct.

  4. The Late Devonian Extinction

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    Video caption: Melvyn Bragg and guests discuss one of the five major extinction events on Earth so far.

    Melvyn Bragg and guests discuss the disappearance of up to 70 per cent of species roughly 370 million years ago at the end of The Age of Fishes, and the range of possible causes.

  5. Video content

    Video caption: Impact angle made 'dinosaur asteroid' particularly lethal

    Scientists investigate why a life-destroying space rock had the effect it did 66 million years ago.