A swan reacts as Swan Uppers record details of cygnets during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

Cygnets swim past Swan Uppers during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

A Swan Upper returns a cygnet after recording details during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville TPX IMAGES OF THE DAY 

Swan Uppers record details of a cygnet during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

Detail is seen on the hat of David Barber, The Queen's Swan Marker, as Swan Uppers record details during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

A Swan Upper conducts a health check on a cygnet during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

David Barber, The Queen's Swan Marker, handles a rescued cygnet during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

Swan Uppers recording details of a cygnet during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

A Swan Upper handles an injured swan during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

Swan Uppers record return a cygnet after recording details during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

A swan reacts as Swan Uppers record details of cygnets during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

Swan Uppers record details of cygnets during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

Detail of a Swan Upper's outfit is seen during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

David Barber, The Queen's Swan Marker, handles a rescued cygnet during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

Swan Uppers moor their boats to take a break at The Swan pub during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

Swan Uppers record details of a cygnet during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

A swan reacts as Swan Uppers record details of cygnets during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville 

Swan Uppers are towed during the annual census of the swan population along sections of the River Thames, Shepperton near Windsor, Britain, July 18, 2022. REUTERS/Toby Melville