What has eyes on the tips of its 20 arms, venomous spines, is almost impossible to kill — and is munching the world’s largest reef?
Meet the crown-of-thorns starfish.
Professor Morgan Pratchett has spent years studying this formidable predator. He’s been on the pointy end of one more than once — and lived to tell the tale.
In this episode, he reveals new research that could help tackle this army of millions.

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