Field signs. The size of crows, smaller than average, but more dlinnohvostogo pomornika. The average pair of steering wheel tight and pointed in favor of the cut tail slightly, at 6-10 see general nature of color as that of other skuas, but the upper body of gray rather than dark brown, lighter than others. Do birds morfy all bright white belly, individual color variation is expressed to a greater or lesser intensity uniformly brown (not a pestrin) color around the neck and chest - from very light, almost white, with light yellow or weak burovatogo flown to a broad dark brown cross-bands. Can meet the birds with a strong touch of brown on the underside of the body and light schekami. Young brown, more or less opestrennye, or even striped, with great individual variation, from dark brown to fox-whitish color. Two Legs - bobbin gray-blue, black fingers and the membrane. Unlike the young of other species, young birds of this type of secondary steering slightly elongated, sharp-tipped, on the underside of the wing, one bright spot - at the base of primary makhovaya (as well as adult birds ). That spot was less than the average skuas, but more than dlinnohvostyh. There poluvzroslyh birds (2-3rd year) for dark top and bottom of the wings of many bright pestrin, merge into cross-stripes on a bright dark belly cross pestriny, the average steering shorter than in adults, but it is well made. Weight 310-630 g body length 46-67 cm wing 30,6-35,3 cm, the magnitude of 97-115 cm (Ryabitsev, 2001). When intraspecific demonstrations and territorial conflicts - the voice of protyazhnye loud meow shouting "mmyaaaaa, myaaaaa ...", or" yeeeaa ... " With concern to the nest - soft short "kyu" or "ki". Birds of prey attack with short jerky "kego" or "Keio", tries to cry. From the nest to give throat squeak (Ryabitsev, 2001).  Distribution. Rarely, occasionally, but the zonal plan more widespread tundra appearance than the average skua. The most typical, perhaps, for the northern and central parts of sub-typical tundra, to a lesser extent - for the southern part of the subzone and Arctic tundra. In good years sporadichno nest and the polar islands (in the area of polar desert) and found to the south to strip extreme northern taiga, but probably not jacks (Rogacheva, 1988).
Habitats. Favorite nest habitat - raw floodplain tundra and tundra moss-grass marsh (Ryabitsev, 2001). Phenology. Arrives at the Taimyr in the first decade of June, in a mass following after the number 15. Masonry from the end of June (Syroechkovsky, Rogacheva, 1980). Reproduction. Nest is a pit of low kochek or directly to the swamp, with the litter of moss and grass or even without lining. In laying 2, less 1 egg. Coloring eggs - from clay or ohristo-yellow to burovatoy, drill or olive green, with varying intensity and density of brown and brown spots and dots. The size of eggs 50-65 x 37-45 mm. Nasizhivayut male and female 24-28 days. Expelled from the vicinity of the nest birds of prey, together, gulls and other skuas. When a man flying around with alarms, and if come closer to the jack or Hidden chicks are beginning to squeak challenged flakes wings and "crawl". Some birds, especially those that are often see people and get used to it, diving and issue alerts attack. The young are starting to fly through 25-30 days after hatching (Ryabitsev, 2001). Nutrition. With plenty Lemming feed and chicks are fed mainly by them. If the number of rodents low korotkohvostye pomorniki engaged mainly looking for bird nests and ruin. In addition, the successful catch in the air of small sandpipers and vorobinyh, Dogonyat them in the air in rapid mobility and flight. Particularly successful are those chasing a pair of skuas. Gladly eat berries, carrion, all kinds of waifs and strays from human housing (Ryabitsev, 2001). The size and nesting success depends on the abundance of small rodents, mainly Lemming (Rogacheva, 1988). References. |
