A woman was just telling her friend how much she loves oysters, but was left horrified after opening one and spotting something 'swimming' inside ...

Oyster sales boomed from the early 19th century onwards, and the shellfish were sold as street food across London, Paris, and New York as they remained a cheap and accessible snack to many.

She said that few people in the UK would have have seen a native flat oyster. "Oysters still exist in these waters but they’re scattered, and the reefs they built are gone," she said.