Gull ID - Ukraine (1 Viewer)

[Petro Hryniuk]

Hello! Help with identification please. Herring Gull (1-4) and Caspian Gull (5-7)?
Ukraine, Rivne region, 6.05.2024 (photo by Vasyl Ilchuk).

 

[lou salomon]

5-7 is a 2cy (pure) cachinnans allright.
1-4 mostly looks like a Herring Gull but there are some indications that it has either a parent or a grandparent Caspian Gull: a few wing coverts are replaced to 2nd generation, inner primaries are not as pale as in most HG, lots of white on tail and rump. Still, this could be labelled as argentatus, even if there is some cachinnans blood in it.