Boats with men in uniform go out onto the Thames on an important mission. The teams will have to count all the swans, which in Great Britain are considered the property of the king.
The annual tradition dates back to the 12th century. Chief swan keeper David Barber is responsible for counting. Many spectators usually come to watch the event. Some may think that this tradition is long outdated. But it has practical significance: it helps monitor the health of birds.
Barber served Queen Elizabeth II for many years. And last year he came under the authority of Charles III. He says that the current monarch is an ideal patron because he has always been interested in environmental issues. It will take the team about five days to complete the journey up the Thames.
