Britain Has a New King. The Swans Have a New Owner. - The New York Times

King Charles III's succession after Queen's death sees swans get a new owner, Royal, News

No, the King doesn't own all the swans in Britain

Mute swan - Wikipedia

Swans in decline: numbers in London drop by 40 per cent

Queen Elizabeth II, Britain's monarch for 70 years, dies

Surprising fact: Almost all the swans of England were owned by the Queen - HT School

Swan wrangling and 'steamy trysts': the unusual lives and jobs of the king's entourage, Monarchy

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No, the King doesn't own all the swans in Britain

Queen Elizabeth dies:What King Charles III now owns