THE Queen’s swan marker gave a talk at the River and Rowing Museum in Henley.
David Barber, 64, who has held the position since 1993, talked about the tradition of swan upping, which began in the 12th century.
This is the annual census of swans on the river from Sunbury-on-Thames to Abingdon over five days in July.
Mr Barber said: “Swan upping isn’t just about swans, it’s about the River Thames, the boats we use, the locks we go through, the royalty, the history. I’m responsible for the royal swan upping to make sure that runs properly each year.”
Mr Barber was made a Member of the Royal Victorian Order in the New Year Honours.