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Nature's Great InvadersEpisodes Episode guide
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5. Ash dieback fungus
5/5How do we protect our native wildlife from invisible invaders like the ash-dieback fungus.
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4. Ring-necked Parakeet
4/5How invasive is the ring-necked parakeet?
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3. Harlequin Ladybird
3/5Derek Mooney finds out how the harlequin ladybird became the UK's fastest invader ever.
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2. Japanese Knotweed
2/5Does Japanese knotweed deserve its place as the most hated plant in the UK?
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1. Grey Squirrel
1/5The natural history story of the UK's most famous invader - the grey squirrel.
