Why the Crown keeps a tally of Thames swans
The count is part of an old claim of ownership, but today it also serves a practical purpose: it gives swan keepers a chance to check the birds’ condition and track how the population is doing.
The annual survey is known as Swan Upping. Boats travel sections of the Thames, looking for mute swans and their young. When a family is found, keepers can examine the birds and identify cygnets with numbered rings. Those records help distinguish individual birds and follow them over time.
From royal privilege to wildlife monitoring
The Crown’s traditional claim applies to unmarked mute swans on open water, though ownership of swans on the Thames is also associated with two historic livery companies, the Vintners’ and Dyers’ Companies. The custom grew out of a period when swans were valued as food as well as status symbols. Keeping track of them helped safeguard a resource once treated as a valuable possession.
That role has changed. The count is not simply an inventory of royal property: handling the birds provides an opportunity to check for injuries or other problems, while the tally offers a picture of breeding and survival along the river. A ceremony rooted in ownership now doubles as a recurring wildlife check.
Why the old custom still matters
The Thames is a living habitat, not a fixed collection of birds. A yearly record can show whether swans are nesting successfully and whether changes in their numbers warrant attention. The Crown’s old claim gives the event its name and pageantry; the close-up work with families of swans is what makes the count useful today.
