large gulls

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

Details

coordinator
Eric Stienen
website none
cr-birding https://cr-birding.org/node/337
ring area Belgium
animals 11660
observations 161705, of which 12798 are captures
ringed in 1986 to 2021
no project description

Example bird

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

Data entry