The annual census of royal swans on the River Thames began on Monday, July 13, 2025 [2].
This tradition, known as "Swan Upping," allows officials to monitor the health and population of the birds. The process is critical for wildlife conservation, particularly as officials track the impact of recent avian-flu outbreaks [1, 4].
The practice is rooted in a royal prerogative that is approximately 800 years old [1]. Under this long-standing tradition, all swans on the Thames are legally the property of the British monarch [3]. While the prerogative once focused on ownership, the modern iteration of the event prioritizes the welfare of the birds.
Officials conduct the census across various stretches of the River Thames in England, including the waters around Chertsey [1, 5]. The process involves counting the birds and checking their physical condition to ensure the population remains stable.
The transition of the crown from Queen Elizabeth II to King Charles III maintains the continuity of the census [1, 2]. The royal ownership remains a legal fixture of the river's ecosystem, though the primary goal has shifted toward scientific data collection, and avian health management [4].
By identifying sick or injured birds during the count, conservationists can provide necessary interventions. This systematic approach ensures that the royal swan population is protected against environmental threats and disease [4].
“The tradition of Swan Upping is about 800 years old.”
The continuation of Swan Upping demonstrates how ancient royal prerogatives can be repurposed for modern ecological needs. By maintaining a legal claim to the swans, the British monarchy provides a structured framework for consistent, long-term biological monitoring of the River Thames, turning a symbolic tradition into a functional tool for public health and wildlife management.
