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Billede information:
Fugleart: Skifermåge - (Larus schistisagus) - Slaty-backed Gull
Fugleart (IOC): Skifermåge (Larus schistisagus) Slaty-backed Gull - species factsheet
Stemme: Stemmer findes her (eksternt link).
Titel / info: Adult or fourth-winter
Lokalitet: Rainham Landfill, Greater London, Storbritannien
Dato: 13. januar 2011
Billede opsætning: Canon 50D, Canon 500mm F4 lens, Canon 1.4x EFII extender
Fotograf: Dominic Mitchell, Storbritannien
Uploadet den: 17. juni 2011
Hits: Billedet har været vist 2111 gange.


Jan Jörgensen skriver fredag 17. juni 2011 kl. 10.40
Hello Dominic.

Long time no see. Has it been settled now or what?



Dominic Mitchell skriver torsdag 23. juni 2011 kl. 13.54
Hi Jan

Good to hear from you - only recently signed up to Netfugl and still learning how the site works!

My impression is that the majority, perhaps the great majority, of birders in Britain are now comfortable with the ID of this bird as a Slaty-backed Gull. This was especially the case aftr its reappearance later in the winter at Pitsea tip, when a new series of closer photos - plus shots of skins showing variation in mantle tone in 'Birding World' - seemed to settle the main bone of contention.

Several Rarities Committee members have also seen the bird and appear to support it, but of course it remains to be seen whether it will be accepted by both the Rarities Committee and the British Ornithologists' Union's Records Committee as a British first.

Naturally, I hope it will be, but either way the fact that the bird appears to show no problematic feature for Slaty-backed Gull, and nothing clearly indicative of a hybrid origin, should be good enough.

Best wishes


Jan Jörgensen skriver torsdag 23. juni 2011 kl. 15.05
Thanks Dominic.

Good discussions on Surfbirds forum and elsewhere and several good pic (two of them here on Netfugl, your own and Steve Arlow´s had me convinced 99,9 % lacking 1% to be on the safe side, if now that could be considered as being on a safe side.



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