Taken from ABZ today, a post from Dr Chris Gibbins.
"A number of us gull enthusiasts (Ruud Altenburg, Visa Rauste, Hannu
Koskinen, Theo Muusse, Mars Muusse and myself) have just put the
finishing touches to a new web site detailing the identification of
Heuglin's Gull. It deals with heuglini relative to fuscus, graellsii
and intermedius. It is based on heuglini photographed in Russia and a
sample of ringed fuscus, graellsii and intermedius."
Main site web page is :- http://www.gull-research.org/
It may be of interest to some.
I wonder how far, species wise these guys will go.