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Watch the BBC first on iPlayer https://bbc.in/iPlayerHome Programme website: http://www.bbc.co.uk/programmes/p026glz8 A giant red leech hunts down a 70cm long blue worm and sucks it down like spaghetti.

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All our TV channels and S4C are available to watch live through BBC iPlayer, although some programmes may not be available to stream online due to rights. If you would like to read more on what types of programmes are available to watch live, check the 'Are all programmes that are broadcast available on BBC iPlayer?' FAQ https://bbc.in/2m8ks6v.