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Nature's Great Invaders Episodes

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    5. Ash dieback fungus

    5/5 How do we protect our native wildlife from invisible invaders like the ash-dieback fungus.

  2. 4. Ring-necked Parakeet

    4/5 How invasive is the ring-necked parakeet?

  3. 3. Harlequin Ladybird

    3/5 Derek Mooney finds out how the harlequin ladybird became the UK's fastest invader ever.

  4. 2. Japanese Knotweed

    2/5 Does Japanese knotweed deserve its place as the most hated plant in the UK?

  5. 1. Grey Squirrel

    1/5 The natural history story of the UK's most famous invader - the grey squirrel.