Swans

species: 
Bewick's Swan
scientific name: 
Cygnus columbianus bewickii
notes: 

White neckring (with GPS-tracker) with a black 4 alpha-numeric code (three numbers and one letter).

note 1: used neckband codes are 200E-259E and 350E-383E.

note 2 : birds have also a white legring with the same code.

note 3 : the neckbands contain a GPS tracker and solar panels. They may appear yellowish or yellow due to decoloration of the plastic material, especially neckbands 350E-383E.

note 4 : The Netherlands Institute of Ecology is interested in relations of ringed and tracked swans: are they paired, do they have cygnets/siblings/parents? Please upload your sightings including this additional information to www.geese.org."

note 4 :

email sighting submit: 
colour-ring type: 
Neckband.
colour-ring colour (of the c-ring): 
White [W]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
countries where ringed: 
The Netherlands.
Images: 
Last letter (of the c-ring): 
E