Olsen & Larsson describe the structural differences- "compared to Lesser Black-backed Gull race gracilis/intermedius, it is a more elegant looking bird with a smallish-looking head, slender bill and more attenuated rear with very long primary projection beyond tail. The legs are rather short." It is significantly different in plumage with "velvety black upper parts with little or no contrast with the primaries with only narrow white tips soon reduced with wear. Adult winter birds have a white head or just fine streaks around the eyes and on hindneck."
On January 14/2007 I had the good fortune of accompanying Bruce Mactavish, Jared Clarke, Jean Iron and Ron Pittaway to the St. John's Landfill. This is mecca for larophiles. Thousands of large gulls spend ther day here during the winter with such rarities as Slaty-backed and Yellow-legged Gull being regular over the last few years. Other rarities such as Common Gull and Glaucous-winged Gull showing up on occasion with the 1000s of Great Black-baked, Glaucous and Herring Gulls along with a smattering of Lesser Black-backed, Kumlien's and hybrid Gulls.
Possible Baltic Gull
Possible Baltic Gull
Possible Baltic Gull
The above pictures illustrate the key features described in Olsen and Larsson. Elegant looking, smallish head, slender bill and attenuated rear with long primary extension, jet black back with no contrast between back and primaries (only small white window P10), very little white to primary tips, and small amount of streaking around the eye and hindneck.
Possible Baltic Gull
If you look at Olsen and Larson's illustration of the Adult winter Baltic Gull on page 365 I think you will see it is nearly a dead ringer. I have included some pictures of several winter adult L. gracilis/intermedius
for comparison. These two birds were photographed the same day and location.
Lesser Black-backed Gull
Note the contrast between the primary tips and the wings and back along with the extensive head streaking. The bottom bird was photographed in February in North Carolina.
Lesser Black-backed Gull
One final close-up of the head of the possible Baltic Gull.
Possible Baltic Gull
A very intriguing bird that to my eye fills all the criteria for an adult winter Baltic Gull.
Comments would certainly be welcomed.
Kirk
Kirk, another impressive post of an interesting find with great photo documentation. Very interesting looking gull.
ReplyDeleteNice find. Unfortunately not ringed, but there are still good ringing programmes in Finland and N Norway. Hopefully next time provenance. For 350+ ringed Baltics, see also;
ReplyDeletehttp://www.israel.gull-research.org/01cyaug.html
Cheers, Mars
Hi Kirk, do you know what became of this sighting? Was it deemed a nominate fuscus Baltic Gull?
ReplyDeleteThanks,
Amar Ayyash
USA
Yes, what happened to this record!?!
ReplyDelete