The wolverine, Gulo gulo referred to as the glutton, skunk bear, or quickhatch, is the largest land-dwelling species of the family Mustelidae. It is a stocky and muscular carnivore, more resembling a small bear than other mustelids. A solitary animal, it has a reputation for ferocity and strength out of proportion to its size, with the documented ability to kill prey many times larger than itself; the wolverine is found in remote reaches of the Northern boreal forests and subarctic and alpine tundra of the Northern Hemisphere, with the greatest numbers in Northern Canada, the American state of Alaska, the mainland Nordic countries of Europe, throughout western Russia and Siberia. Its population has declined since the 19th century owing to trapping, range reduction and habitat fragmentation; the wolverine is now absent from the southern end of its European range. Genetic evidence suggests that the wolverine is most related to the tayra and martens, all of which shared a Eurasian ancestor. Within the Gulo gulo species, a clear separation occurs between two subspecies: the Old World form Gulo gulo gulo and the New World form G. g. luscus.
Some authors had described as many as four additional North American subspecies, including ones limited to Vancouver Island and the Kenai Peninsula in Alaska. However, the most accepted taxonomy recognizes either the two continental subspecies or G. gulo as a single Holarctic taxon. Compiled genetic evidence suggests most of North America's wolverines are descended from a single source originating from Beringia during the last glaciation and expanding thereafter, though considerable uncertainty to this conclusion is due to the difficulty of collecting samples in the depleted southern extent of the range. Anatomically, the wolverine is muscular animal. With short legs and rounded head, small eyes and short rounded ears, it more resembles a bear than it does other mustelids. Though its legs are short, its large, five-toed paws with crampon-like claws and plantigrade posture enable them to climb up and over steep cliffs and snow-covered peaks with relative ease; the adult wolverine is about the size of a medium dog, with a length ranging from 65–107 cm, a tail of 17–26 cm, a weight of 5.5–25 kg, though exceptionally large males can weigh up to 32 kg.
Another outsized specimen was reported to scale 35 kg. The males can be twice the females' weight. According to some sources, Eurasian wolverines are claimed to be larger and heavier than North American with average weights in excess of 20 kg but this may refer more to areas such as Siberia, as data from European wolverines shows they are around the same size as their American counterparts; the average weight of female wolverines from a study in the Northwest territories of Canada was 10.1 kg and that of males 15.3 kg. In a study from Alaska, the median weight of ten males was 16.7 kg while the average of two females was 9.6 kg. In Ontario, the mean weight of males and females was 9.9 kg. The average weights of wolverines were notably lower in a study from the Yukon, averaging 7.3 kg in females and 11.3 kg in males because these animals from a "harvest population" had low fat deposits. In Finland, the average weight was claimed as 11 to 12.6 kg. The average weight of male and female wolverines from Norway was listed as 10 kg.
Shoulder height is reported from 30 to 45 cm. It is the largest of terrestrial mustelids. Wolverines have thick, oily fur, hydrophobic, making it resistant to frost; this has led to its traditional popularity among hunters and trappers as a lining in jackets and parkas in Arctic conditions. A light-silvery facial mask is distinct in some individuals, a pale buff stripe runs laterally from the shoulders along the side and crossing the rump just above a 25–35 cm bushy tail; some individuals display prominent white hair patches on their chests. Like many other mustelids, it has potent anal scent glands used for marking territory and sexual signaling; the pungent odor has given rise to the nicknames "skunk bear" and "nasty cat." Wolverines, like other mustelids, possess a special upper molar in the back of the mouth, rotated 90 degrees, towards the inside of the mouth. This special characteristic allows wolverines to tear off meat from prey or carrion, frozen solid. Wolverines are considered to be scavengers.
A majority of the wolverine's sustenance is derived from carrion, on which it depends exclusively in winter and early spring. Wolverines may find carrion themselves, feed on it after the predator has finished, or take it from another predator. Wolverines are known to follow wolf and lynx trails, purportedly with the intent of scavenging the remains of their kills. Whether eating live prey or carrion, the wolverine's feeding style appears voracious, leading to the nickname of "glutton". However, this feeding style is believed to be an adaptation to food scarcity in winter; the wolverine is a powerful and versatile predator. Prey consists of small to medium-sized mammal
Nickel is a chemical element with symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is hard and ductile. Pure nickel, powdered to maximize the reactive surface area, shows a significant chemical activity, but larger pieces are slow to react with air under standard conditions because an oxide layer forms on the surface and prevents further corrosion. So, pure native nickel is found in Earth's crust only in tiny amounts in ultramafic rocks, in the interiors of larger nickel–iron meteorites that were not exposed to oxygen when outside Earth's atmosphere. Meteoric nickel is found in combination with iron, a reflection of the origin of those elements as major end products of supernova nucleosynthesis. An iron–nickel mixture is thought to compose Earth's outer and inner cores. Use of nickel has been traced as far back as 3500 BCE. Nickel was first isolated and classified as a chemical element in 1751 by Axel Fredrik Cronstedt, who mistook the ore for a copper mineral, in the cobalt mines of Los, Hälsingland, Sweden.
The element's name comes from a mischievous sprite of German miner mythology, who personified the fact that copper-nickel ores resisted refinement into copper. An economically important source of nickel is the iron ore limonite, which contains 1–2% nickel. Nickel's other important ore minerals include pentlandite and a mixture of Ni-rich natural silicates known as garnierite. Major production sites include the Sudbury region in Canada, New Caledonia in the Pacific, Norilsk in Russia. Nickel is oxidized by air at room temperature and is considered corrosion-resistant, it has been used for plating iron and brass, coating chemistry equipment, manufacturing certain alloys that retain a high silvery polish, such as German silver. About 9% of world nickel production is still used for corrosion-resistant nickel plating. Nickel-plated objects sometimes provoke nickel allergy. Nickel has been used in coins, though its rising price has led to some replacement with cheaper metals in recent years. Nickel is one of four elements that are ferromagnetic at room temperature.
Alnico permanent magnets based on nickel are of intermediate strength between iron-based permanent magnets and rare-earth magnets. The metal is valuable in modern times chiefly in alloys. A further 10% is used for nickel-based and copper-based alloys, 7% for alloy steels, 3% in foundries, 9% in plating and 4% in other applications, including the fast-growing battery sector; as a compound, nickel has a number of niche chemical manufacturing uses, such as a catalyst for hydrogenation, cathodes for batteries and metal surface treatments. Nickel is an essential nutrient for some microorganisms and plants that have enzymes with nickel as an active site. Nickel is a silvery-white metal with a slight golden tinge, it is one of only four elements that are magnetic at or near room temperature, the others being iron and gadolinium. Its Curie temperature is 355 °C; the unit cell of nickel is a face-centered cube with the lattice parameter of 0.352 nm, giving an atomic radius of 0.124 nm. This crystal structure is stable to pressures of at least 70 GPa.
Nickel belongs to the transition metals. It is hard and ductile, has a high for transition metals electrical and thermal conductivity; the high compressive strength of 34 GPa, predicted for ideal crystals, is never obtained in the real bulk material due to the formation and movement of dislocations. The nickel atom has two electron configurations, 3d8 4s2 and 3d9 4s1, which are close in energy – the symbol refers to the argon-like core structure. There is some disagreement. Chemistry textbooks quote the electron configuration of nickel as 4s2 3d8, which can be written 3d8 4s2; this configuration agrees with the Madelung energy ordering rule, which predicts that 4s is filled before 3d. It is supported by the experimental fact that the lowest energy state of the nickel atom is a 3d8 4s2 energy level the 3d8 4s2 3F, J = 4 level. However, each of these two configurations splits into several energy levels due to fine structure, the two sets of energy levels overlap; the average energy of states with configuration 3d9 4s1 is lower than the average energy of states with configuration 3d8 4s2.
For this reason, the research literature on atomic calculations quotes the ground state configuration of nickel as 3d9 4s1. The isotopes of nickel range in atomic weight from 48 u to 78 u. Occurring nickel is composed of five stable isotopes. Isotopes heavier than 62Ni cannot be formed by nuclear fusion without losing energy. Nickel-62 has the highest mean nuclear binding energy per nucleon of any nuclide, at 8.7946 MeV/nucleon. Its binding energy is greater than both 56Fe and 58Fe, more abundant elements incorrectly cited as having the most tightly-bound nuclides. Although this would seem to predict nickel-62 as the most abundant heavy element in the universe, the high rate of photodisintegration of nickel in stellar interiors causes iron to be by far the most abundant. Stable isotope nickel-60 is the daughter product of the extinct radionuclide 60Fe, whi
The moose or elk, Alces alces is a member of the New World deer subfamily and is the largest and heaviest extant species in the Deer family. Moose are distinguished by the palmate antlers of the males. Moose inhabit boreal forests and temperate broadleaf and mixed forests of the Northern Hemisphere in temperate to subarctic climates. Hunting and other human activities have caused a reduction in the size of the moose's range over time. Moose have been reintroduced to some of their former habitats. Most moose are found in Canada, New England, Baltic states, Russia, their diet consists of both aquatic vegetation. The most common moose predators are the gray wolf along with humans. Unlike most other deer species, moose do not form herds and are solitary animals, aside from calves who remain with their mother until the cow begins estrus, at which point the cow chases away young bulls. Although slow-moving and sedentary, moose can become aggressive and move if angered or startled, their mating season in the autumn features energetic fights between males competing for a female.
Alces alces is called an "elk" in British English. The word "elk" in North American English refers to a different species of deer, the Cervus canadensis called the wapiti. A mature male moose is called a bull, a mature female a cow, an immature moose of either sex a calf; the word "elk" originated in Proto-Germanic, from which Old English evolved and has cognates in other Indo-European languages, e.g. elg in Danish/Norwegian. In the continental-European languages, these forms of the word "elk" always refer to the Alces alces; the word "moose" had first entered English by 1606 and is borrowed from the Algonquian languages, involved forms from multiple languages mutually reinforcing one another. The Proto-Algonquian form was *mo·swa; the moose became extinct in Britain during the Bronze Age, long before the European arrival in the Americas. The youngest bones were found in Scotland and are 3,900 years old; the word "elk" remained in usage because of its existence in continental Europe but, without any living animals around to serve as a reference, the meaning became rather vague to most speakers of English, who used "elk" to refer to "large deer" in general.
Dictionaries of the 18th century described "elk" as a deer, "as large as a horse". Confusingly, the word "elk" is used in North America to refer to a different animal, Cervus canadensis, called by the Algonquian indigenous name, "wapiti"; the British began colonizing America in the 17th century, found two common species of deer for which they had no names. The wapiti appeared similar to the red deer of Europe although it was much larger and was not red; the moose was a rather strange-looking deer to the colonists, they adopted local names for both. In the early days of American colonization, the wapiti was called a grey moose and the moose was called a black moose, but early accounts of the animals varied wildly, adding to the confusion; the wapiti is superficially similar to the red deer of central and western Europe, although it is distinctly different behaviorally and genetically. Early European explorers in North America in Virginia where there were no moose, called the wapiti "elk" because of its size and resemblance to familiar-looking deer like the red deer.
The moose resembled the "German elk", less familiar to the British colonists. For a long time neither species were called a variety of things. In North America the wapiti became known as an elk while the moose retained its Anglicized Native-American name. In 1736, Samuel Dale wrote to the Royal Society of Great Britain: The common light-grey moose, called by the Indians and the large or black-moose, the beast whose horns I herewith present; as to the grey moose, I take it to be no larger than what Mr. John Clayton, in his account of the Virginia Quadrupeds, calls the Elke... was in all respects like those of our red-deer or stags, only larger... The black moose is accounted a large creature.... The stag, buck, or male of this kind has a palmed horn, not like that of our common or fallow-deer, but the palm is much longer, more like that of the German elke. Moose require habitat with adequate edible plants, cover from predators, protection from hot or cold weather. Moose travel among different habitats with the seasons to address these requirements.
Moose are cold-adapted mammals with thickened skin, heat-retaining coat, a low surface:volume ratio, which provides excellent cold tolerance but poor heat tolerance. Moose survive hot weather by immersion in cool water. In hot weather, moose are found wading or swimming in lakes or ponds; when heat-stressed, moose may fail to adequately forage in summer and may not gain adequate body fat to survive the winter. Also
The tree line is the edge of the habitat at which trees are capable of growing. It is found at high latitudes. Beyond the tree line, trees cannot tolerate the environmental conditions; the tree line is sometimes distinguished from a lower timberline or forest line, the line below which trees form a forest with a closed canopy. At the tree line, tree growth is sparse and deformed by wind and cold; this is sometimes known as krummholz. The tree line appears well-defined, but it can be a more gradual transition. Trees grow shorter and at lower densities as they approach the tree line, above which they cease to exist. Several types of tree lines are defined in ecology and geography: An alpine tree line is the highest elevation that sustains trees; the climate above the tree line of mountains is called an alpine climate, the terrain can be described as alpine tundra. Treelines on north-facing slopes in the northern hemisphere are lower than on south-facing slopes, because the increased shade on north-facing slopes means the snowpack takes longer to melt.
This shortens the growing season for trees. In the southern hemisphere, the south-facing slopes have the shorter growing season; the alpine tree line boundary is abrupt: it forms a transition zone between closed forest below and treeless alpine tundra above. This zone of transition occurs "near the top of the tallest peaks in the northeastern United States, high up on the giant volcanoes in central Mexico, on mountains in each of the 11 western states and throughout much of Canada and Alaska". Environmentally dwarfed shrubs form the upper limit; the decrease in air temperature due to increasing elevation causes the alpine climate. The rate of decrease can vary in different mountain chains, from 3.5 °F per 1,000 feet of elevation gain in the dry mountains of the western United States, to 1.4 °F per 1,000 feet in the moister mountains of the eastern United States. Skin effects and topography can create microclimates. Compared with arctic timberlines, alpine timberlines may receive fewer than half of the number of degree days based on air temperature, but because solar radiation intensities are greater at alpine than at arctic timberlines the number of degree days calculated from leaf temperatures may be similar.
Summer warmth sets the limit to which tree growth can occur, for while timberline conifers are frost-hardy during most of the year, they become sensitive to just 1 or 2 degrees of frost in mid-summer. A series of warm summers in the 1940s seems to have permitted the establishment of "significant numbers" of spruce seedlings above the previous treeline in the hills near Fairbanks, Alaska. Survival depends on a sufficiency of new growth to support the tree; the windiness of high-elevation sites is a potent determinant of the distribution of tree growth. Wind can mechanically damage tree tissues directly, including blasting with windborne particles, may contribute to the desiccation of foliage of shoots that project above snow cover. At the alpine timberline, tree growth is inhibited when excessive snow lingers and shortens the growing season to the point where new growth would not have time to harden before the onset of fall frost. Moderate snowpack, may promote tree growth by insulating the trees from extreme cold during the winter, curtailing water loss, prolonging a supply of moisture through the early part of the growing season.
However, snow accumulation in sheltered gullies in the Selkirk Mountains of southeastern British Columbia causes the timberline to be 400 metres lower than on exposed intervening shoulders. In a desert, the tree line marks; these tend to be called the "lower" tree line, occur below about 5,000 ft elevation in the desert of the southwestern United States. The desert tree line tends to be lower on pole-facing slopes than equator-facing slopes, because the increased shade on the former keeps them cooler and prevents moisture from evaporating as giving trees a longer growing season and more access to water. In some mountainous areas, higher elevations above the condensation line, or on equator-facing and leeward slopes, can result in low rainfall and increased exposure to solar radiation; this dries out the soil. Many south-facing ridges of the mountains of the Western U. S. have a lower treeline than the northern faces because of aridity. Different tree species have different tolerances to cold. Mountain ranges isolated by oceans or deserts may have restricted repertoires of tree species with gaps that are above the alpine tree line for some species yet below the desert tree line for others.
For example, several mountain ranges in the Great Basin of North America have lower belts of Pinyon Pines and Junipers separated by intermediate brushy but treeless zones from upper belts of Limber and Bristlecone Pines. On coasts and isolated mountains the tree line is much lower than in corresponding altitudes inland and in larger, more complex mountain systems, because strong winds reduce tree growth. In addition the lack of suitable soil, such as along talus slopes or exposed rock formations, prevents trees from gaining an adequate foothold and exposes them to drought and sun; the arctic tree line is the northernmost latitude in the Northern Hemisphere where tr
Montana is a landlocked state in the Northwestern United States. Montana has several nicknames, although none are official, including "Big Sky Country" and "The Treasure State", slogans that include "Land of the Shining Mountains" and more "The Last Best Place". Montana is the 4th largest in area, the 8th least populous, the 3rd least densely populated of the 50 U. S. states. The western half of Montana contains numerous mountain ranges. Smaller island ranges are found throughout the state. In all, 77 named; the eastern half of Montana is characterized by badlands. Montana is bordered by Idaho to the west, Wyoming to the south, North Dakota and South Dakota to the east, the Canadian provinces of British Columbia and Saskatchewan to the north; the economy is based on agriculture, including ranching and cereal grain farming. Other significant economic resources include oil, coal, hard rock mining, lumber; the health care and government sectors are significant to the state's economy. The state's fastest-growing sector is tourism.
Nearly 13 million tourists annually visit Glacier National Park, Yellowstone National Park, the Beartooth Highway, Flathead Lake, Big Sky Resort, other attractions. The name Montana comes from the Spanish word Montaña, which in turn comes from the Latin word Montanea, meaning "mountain", or more broadly, "mountainous country". Montaña del Norte was the name given by early Spanish explorers to the entire mountainous region of the west; the name Montana was added to a bill by the United States House Committee on Territories, chaired at the time by Rep. James Ashley of Ohio, for the territory that would become Idaho Territory; the name was changed by Representatives Henry Wilson and Benjamin F. Harding, who complained Montana had "no meaning"; when Ashley presented a bill to establish a temporary government in 1864 for a new territory to be carved out of Idaho, he again chose Montana Territory. This time Rep. Samuel Cox of Ohio, objected to the name. Cox complained the name was a misnomer given most of the territory was not mountainous and that a Native American name would be more appropriate than a Spanish one.
Other names such as Shoshone were suggested, but it was decided the Committee on Territories could name it whatever they wanted, so the original name of Montana was adopted. Montana is one of the nine Mountain States, located in the north of the region known as the Western United States, it borders North South Dakota to the east. Wyoming is to the south, Idaho is to the west and southwest, three Canadian provinces, British Columbia and Saskatchewan, are to the north. With an area of 147,040 square miles, Montana is larger than Japan, it is the fourth largest state in the United States after Alaska and California. S. state. The state's topography is defined by the Continental Divide, which splits much of the state into distinct eastern and western regions. Most of Montana's 100 or more named mountain ranges are in the state's western half, most of, geologically and geographically part of the Northern Rocky Mountains; the Absaroka and Beartooth ranges in the state's south-central part are technically part of the Central Rocky Mountains.
The Rocky Mountain Front is a significant feature in the state's north-central portion, isolated island ranges that interrupt the prairie landscape common in the central and eastern parts of the state. About 60 percent of the state is part of the northern Great Plains; the Bitterroot Mountains—one of the longest continuous ranges in the Rocky Mountain chain from Alaska to Mexico—along with smaller ranges, including the Coeur d'Alene Mountains and the Cabinet Mountains, divide the state from Idaho. The southern third of the Bitterroot range blends into the Continental Divide. Other major mountain ranges west of the Divide include the Cabinet Mountains, the Anaconda Range, the Missions, the Garnet Range, Sapphire Mountains, Flint Creek Range; the Divide's northern section, where the mountains give way to prairie, is part of the Rocky Mountain Front. The front is most pronounced in the Lewis Range, located in Glacier National Park. Due to the configuration of mountain ranges in Glacier National Park, the Northern Divide crosses this region and turns east in Montana at Triple Divide Peak.
It causes the Waterton River and Saint Mary rivers to flow north into Alberta, Canada. There they join the Saskatchewan River, which empties into Hudson Bay. East of the divide, several parallel ranges cover the state's southern part, including the Gravelly Range, the Madison Range, Gallatin Range, Absaroka Mountains and the Beartooth Mountains; the Beartooth Plateau is the largest continuous land mass over 10,000 feet high in the continental United States. It contains Granite Peak, 12,799 feet high. North of these ranges are the Big Belt Mountains, Bridger Mountains, Tobacco Roots, several island ranges, including the Crazy Mountains and Little Belt Mountains. Between many mountain ranges are rich river valleys; the Big Hole Valley, Bitterroot Valley, Gallatin Valley, Flathead Valley, Paradise Valley have extensive agricultural resources and multiple opportunities for tourism and recreation. East and north of this transition zone are the expansive and sparsely populated Northern Plains, with tableland prairies, smaller island mountain ranges, badlands.
The isolated island ranges east of the Divide include the Bear Paw Mountains, Bull Mountains, Castle Mountains, Crazy Mountains, Highwood Mountains, Judi
Alaska is a U. S. state in the northwest extremity of North America, just across the Bering Strait from Asia. The Canadian province of British Columbia and territory of Yukon border the state to the east and southeast, its most extreme western part is Attu Island, it has a maritime border with Russia to the west across the Bering Strait. To the north are the Chukchi and Beaufort seas—southern parts of the Arctic Ocean; the Pacific Ocean lies to southwest. It is the largest U. S. state by the seventh largest subnational division in the world. In addition, it is the most sparsely populated of the 50 United States. Half of Alaska's residents live within the Anchorage metropolitan area. Alaska's economy is dominated by the fishing, natural gas, oil industries, resources which it has in abundance. Military bases and tourism are a significant part of the economy; the United States purchased Alaska from the Russian Empire on March 30, 1867, for 7.2 million U. S. dollars at two cents per acre. The area went through several administrative changes before becoming organized as a territory on May 11, 1912.
It was admitted as the 49th state of the U. S. on January 3, 1959. The name "Alaska" was introduced in the Russian colonial period when it was used to refer to the Alaska Peninsula, it was derived from an Aleut-language idiom. It means object to which the action of the sea is directed. Alaska is the northernmost and westernmost state in the United States and has the most easterly longitude in the United States because the Aleutian Islands extend into the Eastern Hemisphere. Alaska is the only non-contiguous U. S. state on continental North America. It is technically part of the continental U. S. but is sometimes not included in colloquial use. S. called "the Lower 48". The capital city, Juneau, is situated on the mainland of the North American continent but is not connected by road to the rest of the North American highway system; the state is bordered by Yukon and British Columbia in Canada, to the east, the Gulf of Alaska and the Pacific Ocean to the south and southwest, the Bering Sea, Bering Strait, Chukchi Sea to the west and the Arctic Ocean to the north.
Alaska's territorial waters touch Russia's territorial waters in the Bering Strait, as the Russian Big Diomede Island and Alaskan Little Diomede Island are only 3 miles apart. Alaska has a longer coastline than all the other U. S. states combined. Alaska is the largest state in the United States by total area at 663,268 square miles, over twice the size of Texas, the next largest state. Alaska is larger than all but 18 sovereign countries. Counting territorial waters, Alaska is larger than the combined area of the next three largest states: Texas and Montana, it is larger than the combined area of the 22 smallest U. S. states. There are no defined borders demarcating the various regions of Alaska, but there are six accepted regions: The most populous region of Alaska, containing Anchorage, the Matanuska-Susitna Valley and the Kenai Peninsula. Rural unpopulated areas south of the Alaska Range and west of the Wrangell Mountains fall within the definition of South Central, as do the Prince William Sound area and the communities of Cordova and Valdez.
Referred to as the Panhandle or Inside Passage, this is the region of Alaska closest to the rest of the United States. As such, this was where most of the initial non-indigenous settlement occurred in the years following the Alaska Purchase; the region is dominated by the Alexander Archipelago as well as the Tongass National Forest, the largest national forest in the United States. It contains the state capital Juneau, the former capital Sitka, Ketchikan, at one time Alaska's largest city; the Alaska Marine Highway provides a vital surface transportation link throughout the area, as only three communities enjoy direct connections to the contiguous North American road system. Designated in 1963; the Interior is the largest region of Alaska. Fairbanks is the only large city in the region. Denali National Park and Preserve is located here. Denali is the highest mountain in North America. Southwest Alaska is a sparsely inhabited region stretching some 500 miles inland from the Bering Sea. Most of the population lives along the coast.
Kodiak Island is located in Southwest. The massive Yukon–Kuskokwim Delta, one of the largest river deltas in the world, is here. Portions of the Alaska Peninsula are considered part of Southwest, with the remaining portions included with the Aleutian Islands; the North Slope is tundra peppered with small villages. The area is known for its massive reserves of crude oil, contains both the National Petroleum Reserve–Alaska and the Prudhoe Bay Oil Field; the city of Utqiagvik known as Barrow, is the northernmost city in the United States and is located here. The Northwest Arctic area, anchored by Kotzebue and containing the Kobuk River valley, is regarded as being part of this region. However, the respective Inupiat of the No
The grizzly bear is a large population of the brown bear inhabiting North America. Scientists do not use the name grizzly bear but call it the North American brown bear. Multiple morphological forms sometimes recognized as subspecies exist, including the mainland grizzly, Kodiak bear, peninsular grizzly, the extinct California grizzly and Mexican grizzly bear. On average bears near the coast tend to be larger; the Ussuri brown bear inhabiting Russia, Northern China and Korea is sometimes referred to as the black grizzly, although it is a different subspecies from the bears in America. Meriwether Lewis and William Clark first described it as grisley, which could be interpreted as either "grizzly" or "grisly"; the modern spelling supposes the former meaning. Classification has been revised along genetic lines. There are two morphological forms of Ursus arctos, the grizzly and the coastal brown bears, but these morphological forms do not have distinct mtDNA lineages. Brown bears originated in Eurasia and traveled to North America 50,000 years ago, spreading into the contiguous United States about 13,000 years ago.
In the 19th century, the grizzly was classified as 86 distinct species. However, by 1928 only seven grizzlies remained and by 1953 only one species remained globally. However, modern genetic testing reveals the grizzly to be a subspecies of the brown bear. Rausch found. Therefore, everywhere it is the "brown bear". In 1963 Rausch reduced the number of North American subspecies to one, Ursus arctos middendorffiFurther testing of Y-chromosomes is required to yield an accurate new taxonomy with different subspecies. Coastal grizzlies referred to by the popular but geographically redundant synonym of "brown bear" or "Alaskan brown bear" are larger and darker than inland grizzlies, why they, were considered a different species from grizzlies. Kodiak grizzly bears were at one time considered distinct. Therefore, at one time there were five different "species" of brown bear, including three in North America. Most adult female grizzlies weigh 130 -- 180 kg. Average total length in this subspecies is 198 cm, with an average shoulder height of 102 cm and hindfoot length of 28 cm.
Newborn bears may weigh less than 500 grams. In the Yukon River area, mature female grizzlies can weigh as little as 100 kg. One study found that the average weight for an inland male grizzly was around 272 kilograms and the average weight for a coastal male was around 408 kilograms. For a female, these average weights would be 136 kilograms inland and 227 kilograms coastal, respectively. On the other hand, an occasional huge male grizzly has been recorded which exceeds ordinary size, with weights reported up to 680 kg. A large coastal male of this size may stand up to 3 metres tall on its hind legs and be up to 1.5 metres at the shoulder. Although variable in color from blond to nearly black, grizzly bear fur is brown with darker legs and white or blond tipped fur on the flank and back. A pronounced hump appears on their shoulders. Aside from the distinguishing hump a grizzly bear can be identified by a "dished in" profile of their face with short, rounded ears, whereas a black bear has a straight face profile and longer ears.
A grizzly bear can be identified by its rump, lower than its shoulders, while a black bear's rump is higher. A grizzly bear's front claws measure about 2–4 inches in length and a black bear's measure about 1–2 inches in length. Brown bears are found in Asia and North America, giving them the widest ranges of bear species, they inhabited North Africa and the Middle East. In North America, grizzly bears ranged from Alaska down to Mexico and as far east as the western shores of Hudson Bay, it is most found in Canada. In Canada, there are 25,000 grizzly bears occupying British Columbia, the Yukon, the Northwest Territories and the northern part of Manitoba. An article published in 1954 suggested they may be present in the tundra areas of the Ungava Peninsula and the northern tip of Labrador-Quebec. In British Columbia, grizzly bears inhabit 90% of their original territory. There were 25,000 grizzly bears in British Columbia when the European settlers arrived. However, population size has since decreased due to hunting and habitat loss.
In 2003, researchers from the University of Alberta spotted a grizzly on Melville Island in the high Arctic, the most northerly sighting documented. In 2008, it was estimated. Population estimates for British Columbia are based on hair-snagging, DNA-based inventories, mark-and-recapture, a refined multiple regression