The annual 'Swan Upping' take place on the River Thames
Tim Allman
2018-07-17
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By tradition - every unmarked swan here in the UK is the property of the Crown. But how does the Queen keep track of all the birds she owns? Well - every year she sends out her official 'Swan Marker' - who will count them - in a ceremonial event known as Swan Upping. The BBC's Tim Allman takes up the story.
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