juv cachinnans or michahellis?

[smcgulladdict]

Evening all

This is my first post on this forum and am interested in peoples opinion in this juv gull I photographed on a Landfill site in Norfolk, UK last week. I wonder if it could be a juv cach based on the tertial pattern ( broadish pale edges), spotted undertail coverts, significant pale pattern on inner primaries, pale underwing and double wing barred effect on upper wing in flight. Can michahellis look like this? There were up to 12 juv michs on site.

Thanks for any help

Stef

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[adriaens]

I am not sure if Caspian Gull can be fully excluded here, but the barred inner greater coverts and thin tail band sure fit michahellis better.
For the various appearances of juv. michahellis, have a look here.

[JanJ]

Barred inner greater coverts can be seen in Caspian as well. As Peter say´s michahellis is the beter candidate. If not in all images for all people, nr 2 would do it.

JanJ