I finally took some time to put movies of 2 gulls on youtube.
1) one is a gull that I identified as a uncertain Ring-billed gull and reported on waarnemingen.be with some video stills.
http://www.youtube.com/watch?v=Ci_GSAGT ... e=youtu.be
Some details are posted there.
http://vwgvap.waarnemingen.be/waarneming/view/62983531
2) the second birds looks to me like a hybrid black-headed x mediterranean, seen on 14 feb.
http://www.youtube.com/watch?v=jxiPIxNT ... e=youtu.be
Both were seen on my favorite gull watching patch, Callemoeie, Nazareth, Belgium.
All comments are more very welcome...
Nico