The historic swan upping ceremony, the annual census of the swan population on the Thames, passes through Shepperton LockPhotograph: Steve Parsons/PASwans and cygnets are caught, measured, assessed and tagged on the ThamesPhotograph: Oli Scarff/Getty ImagesSwans and cygnets are caught, measured, assessed and taggedPhotograph: Oli Scarff/Getty Images
Swans and cygnets are caught, measured, assessed and taggedPhotograph: Oli Scarff/Getty ImagesSwans and cygnets are released after the processPhotograph: Oli Scarff/Getty ImagesA swan and cygnet are released by the Queen's Swan Uppers during the ceremony between Shepperton and WindsorPhotograph: Luke Macgregor/ReutersThe historic Swan Upping ceremonyPhotograph: Steve Parsons/PAA cygnet is lifted for inspection by the Queen's Swan Uppers during the annual Swan Upping ceremonyPhotograph: Luke Macgregor/ReutersQueen's swan marker David Barber checks a swanPhotograph: Steve Parsons/PAA swan is assessed and tagged on the ThamesPhotograph: Oli Scarff/Getty ImagesOne of the uppers grabs the adult swan's neck while others get ready to grab the cygnetsPhotograph: Peter Marshall/Demotix/CorbisSwans and cygnets are caught, measured, assessed and tagged on the River Thames during the annual Swan Upping ceremony in London, England. Photograph: Oli Scarff/Getty Images
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