Saving wetlands for wildlife & people

Capture & Marking

WWT provides support to waterbird, and in particular wildfowl, ringers in the UK in a number of ways. If you are a licensed ringer and would like further information about anything listed below, please contact the Species Monitoring Unit at WWT Slimbridge.

For more general information about the Ringing Scheme, please contact the Ringing Unit at the British Trust for Ornithology.


Advice and support
WWT is able to offer advice and training to ringers wishing to begin wildfowl ringing. Aspects include trap design and location, ageing and sexing of wildfowl, and colour-marking methodologies.


Co-ordination of wildfowl colour-marking in the UK
All colour-marking projects in the UK should be registered with WWT in order to avoid duplication by different projects of the colour-marks used. If you are a licensed ringer and wish to initiate a new colour-marking project, please obtain and complete a registration form from the Species Monitoring Unit.

WWT also co-ordinates the colour-marking activities for a number of wildfowl species/populations, particularly geese and swans. Involvement from suitably qualified ringers is sought for most of these, and support can be provided (e.g. provision of colour rings/marks). If you are a licensed ringer and are interested in helping, please contact the Species Monitoring Unit.


WWT colour-marking programmes
In the late 1960s, WWT developed the use of engraved plastic leg rings that can be read in the field enabling individual birds to be recognised without the need for recapture. This has allowed researchers to gain an insight into the life of individual birds, such as family relationships, mortality and breeding success, as well as a better understanding of migration.

Individual marking of birds has provided much of the basis for long-term life-history studies on swans and geese. Please select from the following list of species to find out more on WWT's colour-marking projects:

Bewick's Swan
Whooper Swan
Pink-footed Goose
Greylag Goose
Svalbard Barnacle Goose



Reporting sightings of colour-marked birds
WWT colour-marking projects
WWT are involved with colour-marking of Bewick's Swans, Whooper Swans, Pink-footed Geese, Greylag Geese and Barnacle Geese. For these species, WWT use the following ring colours and codes:

Bewick's Swan

White leg rings (black lettering)
Alpha/alpha/alpha APA-TXZ
Numeric/numeric/alpha 11A-24S
Yellow leg rings (black lettering)
Alpha/alpha/alpha EXJ-ZCZ
Numeric/numeric/numeric 396-910
Green leg rings (white lettering)
Alpha/alpha/alpha AAA-AES


Whooper Swan

Yellow leg rings (black lettering)
Alpha/alpha/alpha AJA-VZZ
Numeric/alpha/alpha 3AA-9ZZ
Alpha/alpha/numeric FA3-ZZ9
Numeric/numeric/alpha 31A-99Z
Alpha/numeric/numeric A33-Z99
Alpha/numeric/alpha A3A-Y9Z
Red leg rings (white lettering)
Alpha/alpha/alpha AAA-ATD


Pink-footed Goose

Grey neck collar
Alpha/numeric A3-U7
Alpha/alpha AA-ZZ
Numeric/alpha 3A-7L
Alpha/alpha/alpha AAA-TZZ
Orange leg ring
Alpha/alpha/alpha AAA-BZZ
White leg ring
Alpha/alpha/alpha AAA-TYZ


If you see any of these species wearing a ring with a code matching one of the combinations listed above, please send your sighting to the following:
- Bewick's Swan and Whooper Swan sightings: colourmarkedswans@wwt.org.uk
- Pink-footed Goose, Greylag Goose and Barnacle Goose sightings: colourmarkedwildfowl@wwt.org.uk


Information to provide when submitting a sighting
When reporting a colour-ring sighting please ensure you provide the following information:
Observer details When and where
Name Date (dd/mm/yy)
Address Location
Email Country
Grid reference/coordinates
Details of bird and ring Further Information
Species Please provide any other information you think may be important or useful
Neck collar (colour and code)
Leg ring (colour and code; left leg/right leg)
Was the bird alive/dead/do not know?


Feedback to observers
Feedback is provided to observers in the form of a life-history for the bird(s) seen. This includes information on where the bird was ringed and a list of locations where it has been seen.

Other colour-marking projects
To report a sighting of a colour-marked duck, goose or swan not listed under the above 'WWT colour-marking projects', please first refer to the European Colour-ring Birding website where a list of project co-ordinators can be found. Records can be submitted directly to the relevant project coordinator or by using the Euring Web Recovery Form.

If you are unable to find what you are looking for, please send your sighting to colourmarkedwildfowl@wwt.org.uk and we will try to forward it to the right person.

Thank you
Our thanks and appreciation goes to all observers who send in sightings of colour-marked birds. Your tremendous effort and support has ensured the continuing success of our colour-marking programmes.




Wildfowl & Wetlands Trust
Slimbridge, Gloucestershire GL2 7BT
T: +44 (0) 1453 891900
E:enquiries@wwt.org.uk
Registered Charity no. 1030884

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