The Zoo has been following the work of the Zoological Society of London and this evening it looks at the ground-breaking work being done at the Bedfordshire attraction involving chimps and heart surgeons.
Click above to watch ITV News Anglia's Olivia Paterson report
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Overnight there'll be mist and fog but it will clear for Sunday leaving sunny spells.
A month of special events for the Norfolk nurse responsible for saving Allied soldiers in the First World war, has begun.
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