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Nature's Great InvadersEpisodes

    5. Ash dieback fungus

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

    4. Ring-necked Parakeet

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

    3. Harlequin Ladybird

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

    2. Japanese Knotweed

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

    1. Grey Squirrel

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