I arrived mid-morning to find few gulls around. After some waiting they began to trickle into the river itself. The turnover was steady as birds came and went from the main flock along the river. A first cycle "Kumlien's" ICELAND GULL and second cycle LESSER BLACK-BACKED GULL appeared side-by-side on the water.
|"Kumlien's" Iceland Gull and Lesser Black-backed Gull at center, among Ring-billed Gulls and a couple Herring Gulls|
Scanning the flock over and over, between bouts of warming up in the car, eventually paid of with an adult MEW GULL of the nominate race, Larus canus canus, often called Common Gull. The bird was seen from various distances in various lighting and weather conditions, from bright overcast to dark with falling snow, from noon to 2pm when the snow really started to come down. The bird was seen roosting on the west bank of the river, roosting in fields at Mitchell Farm, and perching atop the farm buildings. I will include images from several angles and distances.
|First look, digiscoped as it was roosting with Ring-billed Gulls on a lawn across the river. Note that the mantle is only slightly darker than the surrounding Ring-bills, though this varies with angle and light.|
|note very thin gray-green bill with dusky subterminal markings|
|dark eye, sparse head and nape spotting|
|strongly contrasting tertial crescent|
|primary pattern consistent with nominate canus|
After comparing images, I am all but certain that this must be the same individual seen here for a few days last winter. It is quite similar to the Mew Gull I had back in 2009, which was also a pretty classic-looking "Common" Mew Gull...yet not terribly similar to this bird from Cape Ann in 2010, which was not firmly IDed to subspecies.
A great start to 2015!