|
Reverse Migration (bird Migration)
Reverse migration also called reverse misorientation is a phenomenon in bird migration where a bird flies in the opposite direction of what is typical of its species during the spring or autumn migration. If a bird sets off in the opposite direction, shown by the orange arrow, it will end up in Western Europe instead of South East Asia. This is a mechanism that might lead to birds such as Pallas's leaf warblers turning up thousands of kilometres from where they should be. Keith Vinicombe suggested that birds from east of Lake Baikal in Siberia (circled) could not occur in western Europe because the migration routes were too north–south. Most of these lost young birds perish in unsuitable wintering grounds, but there is some evidence that a few survive, and either re-orient in successive winters, or even return to the same area. Reverse migration is genetic or learned behaviour Some large birds such as swans learn migration routes from their parents. However, in most small spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Falsterbo Bird Observatory
Falsterbo (, outdatedly ) is a town located at the south-western tip of Sweden in Vellinge Municipality in Skåne. Falsterbo is situated in the southern part of the Falsterbo peninsula. It is part of Skanör med Falsterbo, one of Sweden's historical cities. Climate ''See Skanör med Falsterbo#Climate for more data.'' History Falsterbo historically enjoyed trading privileges with the Hanseatic League. During the Middle Ages, it was a rich and prestigious town owing to its location in a center of trade and herring fishery. On the beach between Falsterbo and neighboring town Skanör was the Scania Market where merchants from various parts of Europe had fixed market places. Scania Market was a major fish market which took place annually starting about 1200. The market became an important trade center on the Baltic Sea and remained so for 250 years; it was a major source of the Hanseatic League's wealth. The rich herring fishing around the Falsterbo Peninsula accounted for the mar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Garden Peninsula
The Garden Peninsula is a peninsula of in length that extends southwestward into Lake Michigan from the mainland of Michigan's Upper Peninsula. The peninsula is bordered by Lake Michigan on the east, and by Big Bay de Noc on the west. The base of the peninsula is served by U.S. Highway 2, and the peninsula's west shore is reached by M-183. The largest settlement on the peninsula is Garden, Michigan. Many of the peninsula's hardwoods were cut down for use in the charcoal-fired iron furnaces operated by the Jackson Iron Company in 1867–1891 at what is now Fayette State Park, on the peninsula's western shore. With its access to Great Lakes shipping, the remaining lumber of the Garden Peninsula was largely logged by the 1890s. However, the area is still home to endemic plants and disjunct populations. After the conclusion of the old-growth logging era, homesteaders tried to develop an agricultural economy on the cleared land; but these efforts largely failed in the 20th cen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Door County, Wisconsin
Door County is the easternmost county in the U.S. state of Wisconsin. As of the 2020 census, the population was 30,066. Its county seat is Sturgeon Bay. It is named after the strait between the Door Peninsula and Washington Island. The dangerous passage, known as Death's Door, contains shipwrecks and was known to Native Americans and early French explorers. The county was created in 1851 and organized in 1861. Nicknamed the “Cape Cod of the Midwest,” Door County is a popular Upper Midwest vacation destination. It is also home to a small Walloon population. History Native Americans and French Porte des Morts legend Door County's name came from Porte des Morts ("Death's Door"), the passage between the tip of Door Peninsula and Washington Island. The name "Death's Door" came from Native American tales, heard by early French explorers and published in greatly embellished form by Hjalmar Holand, which described a failed raid by the Ho-Chunk (Winnebago) tribe to capture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hematocrit
The hematocrit () (Ht or HCT), also known by several other names, is the volume percentage (vol%) of red blood cells (RBCs) in blood, measured as part of a blood test. The measurement depends on the number and size of red blood cells. It is normally 40.7–50.3% for males and 36.1–44.3% for females. It is a part of a person's complete blood count results, along with hemoglobin concentration, white blood cell count and platelet count. Because the purpose of red blood cells is to transfer oxygen from the lungs to body tissues, a blood sample's hematocrit—the red blood cell volume percentage—can become a point of reference of its capability of delivering oxygen. Hematocrit levels that are too high or too low can indicate a blood disorder, dehydration, or other medical conditions. An abnormally low hematocrit may suggest anemia, a decrease in the total amount of red blood cells, while an abnormally high hematocrit is called polycythemia. Both are potentially life-threatening di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swainson's Thrush (8663598437)
Swainson's thrush (''Catharus ustulatus''), also called olive-backed thrush and russet-backed thrush, is a medium-sized thrush. It is a member of genus ''Catharus'' and is typical of it in terms of its subdued coloration and beautiful, ascending flute-like voice. Swainson's thrush was named after William Swainson, an English ornithologist. Etymology The genus name ''Catharus'' comes from the Ancient Greek ''katharos'', "pure or clean" and refers to the plumage of the orange-billed nightingale-thrush ''C. aurantiirostris''. The specific ''ustuatus'' is Latin for "burnt", from ''urere'', "to burn". Habitat The breeding habitat of Swainson's thrush is coniferous woods with dense undergrowth across Canada, Alaska, and the northern United States; also, deciduous wooded areas on the Pacific coast of North America. Range & distribution These birds migrate to southern Mexico and as far south as Argentina. The coastal subspecies migrate down the Pacific coast of North America and wint ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Birds (magazine)
''British Birds'' is a monthly ornithology magazine that was established in 1907. It is now published by BB 2000 Ltd, which is wholly owned by The British Birds Charitable Trust (registered charity number 1089422), established for the benefit of British ornithology. Its circulation in 2000 was 5,250 copies; its circulation peaked at 11,000 in the late 1980s. The current editor is Stephen Menzie. ''British Birds'' is aimed at serious birdwatchers and ornithologists, rather than the more casual birdwatchers catered for by some other magazines on the subject. It publishes the findings of the British Birds Rarities Committee. Its mascot, and later logo, the red grouse, was chosen because at the time it was thought to be an endemic British species (although it is now considered a subspecies of the willow grouse). In 1916, ''British Birds'' magazine absorbed ''The Zoologist'', due to the latter's shortage of subscribers. Editors The current editor of ''British Birds'' is Stephen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mist Net
Mist nets are used by hunters and poachers, but also by ornithologists and chiropterologists to capture wild birds and bats for banding or other research projects. Mist nets are typically made of nylon or polyester mesh suspended between two poles, resembling a volleyball net. When properly deployed in the correct habitat, the nets are virtually invisible. Mist nets have shelves created by horizontally strung lines that create a loose, baggy pocket. When a bird or bat hits the net, it falls into this pocket, where it becomes tangled. The mesh size of the netting varies according to the size of the species targeted for capture. Mesh sizes can be measured along one side of the edge of a single mesh square, or along the diagonal of that square. Measures given here are along the diagonal. Small passerines are typically captured with 30–38 mm mesh, while larger birds, like hawks and ducks, are captured using mesh sizes of ~127 mm. Net dimensions can vary widely depending ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bird Ringing Larus Argentatus
Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the bee hummingbird to the ostrich. There are about ten thousand living species, more than half of which are passerine, or "perching" birds. Birds have whose development varies according to species; the only known groups without wings are the extinct moa and elephant birds. Wings, which are modified forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in some birds, including ratites, penguins, and diverse endemic island species. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming. Birds ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triangulation
In trigonometry and geometry, triangulation is the process of determining the location of a point by forming triangles to the point from known points. Applications In surveying Specifically in surveying, triangulation involves only angle measurements at known points, rather than measuring distances to the point directly as in trilateration; the use of both angles and distance measurements is referred to as triangulateration. In computer vision Computer stereo vision and optical 3D measuring systems use this principle to determine the spatial dimensions and the geometry of an item. Basically, the configuration consists of two sensors observing the item. One of the sensors is typically a digital camera device, and the other one can also be a camera or a light projector. The projection centers of the sensors and the considered point on the object's surface define a (spatial) triangle. Within this triangle, the distance between the sensors is the base ''b'' and must be known. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sweden
Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, Finland to the east, and is connected to Denmark in the southwest by a bridgetunnel across the Öresund. At , Sweden is the largest Nordic country, the third-largest country in the European Union, and the fifth-largest country in Europe. The capital and largest city is Stockholm. Sweden has a total population of 10.5 million, and a low population density of , with around 87% of Swedes residing in urban areas in the central and southern half of the country. Sweden has a nature dominated by forests and a large amount of lakes, including some of the largest in Europe. Many long rivers run from the Scandes range through the landscape, primarily ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Bird Ringing Larus Argentatus")
