Thames swans: ceremony and conservation
Swan Upping is an annual survey and health check on part of the Thames.

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Swan Upping is an annual survey and health check on part of the Thames. Cygnets are weighed, measured and examined for injuries, including those caused by discarded fishing tackle. The ceremony is also conservation fieldwork.
The Crown retains a right to claim unmarked mute swans in open waters, exercised mainly on particular Thames stretches. This is narrower than the claim that the King owns every swan. The Vintners and Dyers livery companies also hold historic rights. Their cygnets receive identifying rings according to parentage, while Crown birds remain unmarked. A population figure needs a separately dated survey report.
Editorial notes2026-10-30
An institutional explanation of the tradition; numbers and dates require the relevant year's report.
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- Thames swans: ceremony and conservation · institutional source
Swan Upping combines Crown tradition with wild-bird health checks.
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