large gulls

blue ring with 4 letters (third=A or O)

Details

coordinator
Eric Stienen
website none
cr-birding https://www.cr-birding.org/node/337
ring area Belgium
animals 10963
observations 154558, of which 12068 are captures
ringed in 1986 to 2021
no project description

Example bird

YDA.G
Shorthand: B-YDA.G explanation
This is an arbitrary example of a bird that might not exist.

Data entry