Black-headed Gull
scientific name: 
Chroicocephalus ridibundus

White ring with 4 alpha-numeric code  :
starting letter 'E', followed by a number and 2 letters.
starting letter 'E', followed by 2 letters and 1 number.
starting letter 'E', followed by 1 letter / 1 number / 1 letter. (see note 3).

starting letter 'E', followed by 1 number/ 1 letter/ 1 number.

note 1 : do check carefully the code as their is another project/another projectleader. See note 3.  

note 2 : used codes are E0AA-E9ZZ, EAA0-EZZ9, E0A0-E9Z9.

note 3 : used codes : EA0A till EZ9Z are ringed at Griend, The Netherlands. Sightings have to be mailed tot Date Lutterop :

note 4 : E1AA-E6ZZ are ringed as pulli or breeding birds in The Netherlands.

note 5 : E7AA-E0ZZ are ringed as (sub)adult in winter.

note 6 : EAA0-EZZ0 are ringed in summer and winter.

note 7 : E0A0-E9Z9 are ringed in summer and winter in the province Limburg, NL.

note 8 : 

email sighting submit: 
colour-ring type: 
Legring : one, coded.
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.
First letter/number (of the c-ring):