cygnets

The Queen's Swan Marker David Barber and other swan uppers inspect a swan during the annual Swan Upping ceremony on the River Thames between Shepperton and Windsor in southern England...The Queen's Swan Marker David Barber (R) and other swan uppers inspect a swan during the annual Swan Upping ceremony on the River Thames between Shepperton and Windsor in southern England July 14, 2014. Young cygnets are counted and swans and cygnets are assessed for signs of injury or disease during the ceremony. The five-day census of the swan population dates back to the twelfth century when the Crown claimed ownership of all mute swans. Today, the Crown retains the right to ownership of all unmarked mute swans in open water, but The Queen only exercises her ownership on certain stretches of the River Thames and its surrounding tributaries.

Luke MacGregor/Reuters

The Queen’s Swan Marker David Barber (R) and other swan uppers inspect a swan during the annual Swan Upping ceremony on the River Thames between Shepperton and Windsor in southern England on Monday. Young cygnets are counted and swans and cygnets are assessed for signs of injury or disease during the ceremony

Annual Census Of The Swan Population Takes Place On The Thames...SUNBURY, ENGLAND - JULY 15:  Swans and cygnets are caught, measured, assessed and tagged on the River Thames during the annual Swan Upping ceremony on July 15, 2013 in London, England. Swan Upping is the annual census of the River Thames' swan population is led by David Barber, The Queens Swan Marker, it begins on July 15, 2013 in Sunbury and ends at Abingdon, Oxfordshire on July 19, 2013. The Queen's Swan Marker and the accompanying Swan Uppers of the Vintners' and Dyers' Livery Companies use six traditional Thames rowing skiffs in their five-day journey upstream to ensure that the swan population is maintained.  (Photo by Oli Scarff/Getty Images)

Oli Scarff/Getty

Swans and cygnets are caught, measured, assessed and tagged on the River Thames during Swan Upping on Monday in London. Swan Upping, the annual census of the River Thames’ swan population, is led by David Barber, The Queens Swan Marker. It begins on July 15 in Sunbury and ends at Abingdon, Oxfordshire, on July 19. The Queen’s Swan Marker and the accompanying Swan Uppers of the Vintners’ and Dyers’ Livery Companies use six traditional Thames rowing skiffs in their five-day journey upstream to ensure that the swan population is maintained. Read more