Swan Upping, the annual census of the mute swan population living on River Thames
epa10755847 The King's Swan Marker David Barber and his Swan Upping team catch a cygnet during the annual Swan Upping on the River Thames between Marlow and Henley in Britain, 19 July 2023. The annual Swan Upping is a five-day census in which swans and young cygnets belonging to the King are counted and checked for signs of disease or injury. The custom dates back to the twelfth century. EPA/NEIL HALL
