Kalev Rattiste: "It is an Estonian common gull and the number must be Estonia Matsalu U267680. This bird is ringed in our study colony Kakrarahu as a chick 29.05.2001, nest no. 137. I checked and it appears that this bird (quite probably female) has never returned to our study colony to breed. It means that she breeds somewhere else. This is a very valuable information to us. She is 13-year-old now."