England's swan census cancelled

The annual royal English "swan upping" was cancelled this year due to dangerous conditions caused by flooding. The event dates back to the 12th century, when the crown laid claim to all swans on open water. The crown still retains this right.

Rains have made the Thames too high and fast to safely operate boats. There is no known previous record of cancelling the event.

The modern census is part royal pagentry and part ecological study.