<p>Swan Upping at Henley on the river Thames in the UK. A new collection of stock images from Dave Knowles Swan Upping is an annual ceremonial establishing a mute swan census. During the ceremony, the Queen’s, the Vintners’, and the Dyers’ Swan Uppers row up the river Thames in a rowing boat called skiffs. Swan upping serves to check the health of the mute swans on the river Thames, the swans are rounded up, caught, marked, and then released. Check out more stock photography by Dave Knowles…</p>