winter gull was photographed by Rik Winters at the
It is always tricky to speculate about the parentage of such birds but here I go:
The cachinnans-features of this bird are the long wings and long thin legs and the long, slim and parallel bill. The pattern on the tertials, with the broad pale edges, also fit cachinnans. The wingcoverts are of an orange-brown tinge that I (personally) associate with cachinnans. The headshape and the bold patterns on the scapulars, however, arenít like cachinnans at all. These could fit both michahellis and argentatus. I Ďm slightly in favour of michahellis because of the darkish mask around the eye and the square-ish and deep headshape. On the vent and undertail coverts some small chevrons (not unlike cachinnans) and bolder markings (arg/mich) can be seen. The markings on the greater wingcoverts seem somewhere in between cachinnans and michahellis, perhaps a bit closer to the latter.
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