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)