Gulls

species: 
Black-headed Gull
scientific name: 
Chroicocephalus ridibundus
notes: 

Dark-green with a white two alpha-numeric code (on left tarsus).

note 1 : used codes are AA-ZZ, A0-Z9, 0A-9Z and 00-99. 

note 2 : by somes codes is check mark between de code.

note 3: rings a lighter green, but has to be reported as dark-green. See photo. 

note 4: most birds ringed during winter in city-parks since 2025.

note 5 : 

website sighting submit: 
European colour ring Birding submit
email sighting submit: 
website information: 
Frank Majoor website
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Dark Green [G]
colour-ring code (of the c-ring): 
Two alpha-numeric code (2 letters/numbers).
countries where ringed: 
The Netherlands.