Gulls

species: 
Eurasian Mew Gull
scientific name: 
Larus canus
notes: 

White ring with a black four alpha code, always starting with E.

note 1 : codes EAAA-EXZZ can be reported by  http://submit.cr-birding.org/projects/12/

note 2 : codes EYAA-EZZZ can be reported by https://cr-birding.org/nl/node/4507

note 3 :

website sighting submit: 
European colour-ring Birding submit
website information: 
Frank Majoor's website.
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
White [W]
colour-ring code (of the c-ring): 
Four alpha code (4 letters).
countries where ringed: 
The Netherlands.
First letter/number (of the c-ring): 
E