Annual 'Swan Upping' held along the River Thames in London
[]
Men participate in the annual 'Swan Upping' along the River Thames in London on July 15, 2019. /VCG Photo

Men participate in the annual 'Swan Upping' along the River Thames in London on July 15, 2019. /VCG Photo

Each swan is caught and ringed before being released. /VCG Photo

Each swan is caught and ringed before being released. /VCG Photo

The primary purpose is of the yearly activity is to conduct a census of swans and check their health. /VCG Photo

The primary purpose is of the yearly activity is to conduct a census of swans and check their health. /VCG Photo

The centuries-old activity is held annually in the third week of July and runs for five consecutive days. /VCG Photo

The centuries-old activity is held annually in the third week of July and runs for five consecutive days. /VCG Photo