Queen's Swan Marking takes to the Thames

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Officials record and examine cygnetsImage source, Reuters
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Swan Upping has been an annual ceremony on the Thames for hundreds of years

The number of cygnets on the Thames is "slightly lower" than last year as the annual census of the swan population on the river is under way.

In February, more than 30 swans from the Queen's Windsor flock died from an outbreak of bird flu.

The Queen's Swan Marker David Barber says after one day it looks to have only had a small effect on cygnet numbers.

Swan Upping dates to the 12th Century, when the ownership of all unmarked mute swans in open water in Britain was claimed by the Crown in order to ensure a ready supply for feasts.

Swan Uppers row as officials record and examine cygnets and swans during the annual censusImage source, Reuters
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The Royal Swan Uppers, who wear the scarlet uniform of The Queen, travel in traditional rowing skiffs

A cygnet is weighed during the annual Swan Upping censusImage source, Getty Images
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The Swan Uppers weigh, measure and check the cygnets for any injuries

Officials record and examine cygnets and swansImage source, Reuters
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Swan Upping helps both adults and cygnets that might otherwise go untreated

Officials release swans back into the waterImage source, Reuters
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Once checked, officials release swans back into the water

Teams raise a toast to the Queen at the end of the first dayImage source, Getty Images
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Swan Upping teams raise a toast to the Queen at the end of the first day

The Sovereign"s Swan Marker David Barber checks a cygnet during the annual Swan Upping censusImage source, Getty Images
Image caption,

The Queen's Swan Marker David Barber says the numbers are slightly lower than last year

Officials record and examine cygnets and swans during the annual censusImage source, Reuters
Image caption,

The journey takes five days, travelling from Sunbury, Surrey to Abingdon Bridge, Oxfordshire

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