1cy Common Gull variation; wintering Avocets on the Humber; foggy Wolds; Boxing day in the garden; Short-eared owls; a tranquil December morning; Short-eared Owl afternoon; the Gigrin Black / Black-eared Kite revisited; another local Marsh Harrier; three trees; Bittern at 86m; Lincolnshire Wolds day out; Cetti's Warbler habitat; Common Buzzard and Marsh Harrier Juvenile with much brown on head, neck, and back, a dark bar across the wing, and a black tail tip. Juveniles are mottled brown; second-year birds are brown but show gray on the back. Common Gull (Larus canus): 2cy plumage variation in February in Norway In February 2010 I had the opportunity to spend a few days in Stavanger, Norway and the most promising gull spot was the partly frozen lake at Breidavatn in central city. The common gull looks like a small, gentler version of the herring gull, with greenish legs and a yellow bill. The d urati on of the Common Gull migrat ion was the l ongest (on the average 67 days) a nd t he Little Gull migrat ed the most shortly (on the average 29 days). No comments: Post a comment. For instance, one of Ring-billed Gull ID tips is to look for the bird “standing in the parking lot with the sesame-seed bun in its mouth.” Not wrong. They are smaller than the similar herring gull, and have greenish-yellow legs and a yellow bill. They are now seen more often in towns and on housing estates in winter. In this way, largely white-headed, white-bodied, smallish-looking first winter Common Gullin early winter can perhaps best be called “presumably heinei”, while long-billed, massively-built, very darkly-marked birds still largely in juvenile plumage into mid-winter can best be called “presumably kamtschatschensis”. Common gulls are silvery-grey above and white below, with a white head (streaky during the winter) and black wingtips. Variations in egg size and egg composition between females of the same species, as well as among eggs in the same clutch, have been studied in many avian species. The wings have black tips with white spots. I therefore investigated several herring gull traits from multiple colonies with contrasting population trends. Email This BlogThis! These two birds show similar patterns although the left hand bird has a reduced black tip to its outermost primary (P10) …
Herring Gulls take four years to reach adult plumage. 1cy Common Gull variation Posted by Graham Catley at 8:42:00 pm. Among the most frequently seen rarities are Glaucous Gull and Iceland Gull. Despite its name, it is not at all common in most inland areas, though it can be abundant on the coast and in some eastern counties. Little Gull breeds a few places in the country. Other gulls are considered rare. Black-headed gull (summer) ©Amy Lewis. Adults have light-gray backs, black wingtips, and white heads and underparts. Black-headed Gull, Common Gull, European Herring Gull, Great Black-backed Gull, Lesser Black-backed Gull, and Black-legged Kittiwake are all common gull species that breed in mainland Norway.
This variation could be sex-based, individual, could be caused by differences in populations or subspecies or due to intergrades (if indeed they even exist) - or are most likely due to a combination of all of the above.
The extent of black in the wing varies as does the extent of the white markings.
The adults show variation in wingtip pattern. The predominant isolation of H13 and H16 viruses from gull species confirms the common notion that these viruses belong to the influenza A virus “gull lineage.” H13 and H16 viruses are genetically distinct from viruses from other hosts and seem to have adapted to replication in gull hosts in particular [ 3 , 12 ]. Spatial variation in herring gull colony growth rate was observed across the region, potentially driven by the availability of local intertidal and terrestrial resources. Immature similar to nonbreeding adult, but with brownish black bar across the base of the wing, much black in the outer wing, and a black band across the tip of the tail.
Adults. In looking through flocks of Common Gull in South Korea, the single most consistent element is the huge degree of variation. Adults have pale grey upperparts, yellow-green legs, a dark eye and a thin yellow bill. In winter, dusky streaks mark their heads. Share to Twitter Share to Facebook Share to Pinterest. The Common Gull is larger than the Black-headed Gull, but smaller than the Herring Gull.
In the summer, the adult birds have blue-grey wings, back and mantle, and white head, neck and breast.
No gull guide can avoid getting into the weeds with species-identification tips; but the ample photos in this one are bright and clear, and the text avoids self-seriousness. Like a much smaller, cuter version of a herring gull. The legs and bill are duller in winter, when the head is streaked grey. Gulls can be very difficult to tell apart, especially immature birds. As with most gulls, the plumage of the Common Gull varies greatly and depends on age and the time of year.
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