日本語 1 239 000+ 記事. Canadá permite a cazar aos estranxeiros, se van guiados por un inuit na súas zorras de cans. , For the indigenous peoples of the Arctic, polar bears have long played an important cultural and material role.  A male may follow the tracks of a breeding female for 100 km (60 mi) or more, and after finding her engage in intense fighting with other males over mating rights, fights that often result in scars and broken teeth. Os osos polares reprodúcense entre os meses de marzo e xuño, con implantación diferida dos óvulos fecundados, de modo que o período de xestación se torna moi longo, entre 200 a 265 días, variando de acordo coas condicións ambientais.  The remains of polar bears have found in the stomachs of large Greenland sharks (Somniosus microcephalus), although it certainly cannot be ruled out that the bears were merely scavenged by this slow-moving, unusual shark. These alternatives may reduce the rate of weight loss of bears when on land. Because of their dependence on the sea ice, polar bears are classified as marine mammals. Appenzeller, T. and Dimick, D. R. (2004) "The Heat is On,", International Agreement on the Conservation of Polar Bears, Ministry of Natural Resources and Environment, International Union for Conservation of Nature, 2019 mass invasion of Russian polar bears, "Late Pleistocene fossil find in Svalbard: the oldest remains of a polar bear (, 10.2305/IUCN.UK.2015-4.RLTS.T22823A14871490.en, "Alaska, Chukotka sign agreement to manage polar bears", "Education: Marine Mammal Information: Polar Bears", "Unequal Rates of Y Chromosome Gene Divergence during Speciation of the Family Ursidae", "Molecular distance and divergence time in carnivores and primates", "Complete mitochondrial genome of a Pleistocene jawbone unveils the origin of polar bear", "Ancient Hybridization and an Irish Origin for the Modern Polar Bear Matriline", "Nuclear Genomic Sequences Reveal that Polar Bears Are an Old and Distinct Bear Lineage", "Population Genomics Reveal Recent Speciation and Rapid Evolutionary Adaptation in Polar Bears", "Brown bears and polar bears split up, but continued coupling", "List of Marine Mammal Species & Subspecies", "Genetic structure of the world's polar bear populations", Supplementary material for Ursus maritimus Red List assessment, "Killing polar bears in Iceland "only logical thing to do, "The war over the polar bear: Who's telling the truth about the fate of a Canadian icon? Sus presas favoritas son las crías de foca y de beluga, aunque también puede consumir morsas y aves marinas como el arao.  In Quebec, the polar bear is referred to as ours blanc ("white bear") or ours polaire ("polar bear").  Cubs may hum while nursing. "The influence of climate variability on polar bear (, "Diet composition of polar bears in Svalbard and the western Barents Sea", "Interactions between polar bears and overwintering walruses in the Central Canadian High Arctic", "Polar bear metabolism cannot cope with ice loss", "Comments on 'Carnivorous walrus and some Arctic zoonoses, "Hudson Bay Post — Goodbye Churchil [sic] Dump", "What to eat now? , The polar bear's most common hunting method is called still-hunting: the bear uses its excellent sense of smell to locate a seal breathing hole, and crouches nearby in silence for a seal to appear. Algúns animais cativos, expostos a climas quentes e húmidos, desenvolven unha cor verde grazas a algas que crecen nos seus pelos ocos. The mitochondrial DNA (mtDNA) of the polar bear diverged from the brown bear, Ursus arctos, roughly 150,000 years ago.  The treaty allows hunting "by local people using traditional methods". They may also eat plants, including berries, roots, and kelp; however, none of these have been a significant part of their diet, except for beachcast marine mammal carcasses. The only other bear similar in size to the polar bear is the Kodiak bear, which is a subspecies of brown bear. Fish and Wildlife Service published a draft conservation management plan for polar bears to improve their status under the Endangered Species Act and the Marine Mammal Protection Act. , Steven Amstrup and other U.S. Geological Survey scientists have predicted two-thirds of the world's polar bears may disappear by 2050, based on moderate projections for the shrinking of summer sea ice caused by climate change, though the validity of this study has been debated. The skulls of killed polar bears were buried at sacred sites, and altars, called sedyangi, were constructed out of the skulls. ", "Are polar bear populations increasing: in fact, booming? Researchers do not know whether or not this is a new behaviour; before polar ice shrinkage, they opined that there was probably neither the need nor opportunity to swim such long distances. On 15 May 2008, the United States Department of the Interior listed the polar bear as a threatened species under the Endangered Species Act, citing the melting of Arctic sea ice as the primary threat to the polar bear.  Insufficient nourishment leads to lower reproductive rates in adult females and lower survival rates in cubs and juvenile bears, in addition to poorer body condition in bears of all ages. Os territorios, moitas veces enormes, non son defendidos.  In 2010, the Ministry of Natural Resources and Environment published a strategy for polar bear conservation in Russia. During the swim, the bear lost 22% of her body mass and her yearling cub died. For example, The Polar Bear Son is adapted from a traditional Inuit tale. As patas dianteiras son longas para facer máis doada a natación e o mergullo e as patas posteriores teñen 5 dedos. Risks to the polar bear include climate change, pollution in the form of toxic contaminants, conflicts with shipping, oil and gas exploration and development, and human-bear interactions including harvesting and possible stresses from recreational polar-bear watching. The polar bear also hunts by stalking seals resting on the ice: upon spotting a seal, it walks to within 90 m (100 yd), and then crouches. , Oil and gas development in polar bear habitat can affect the bears in a variety of ways.  The television series Lost features polar bears living on the tropical island setting. The Canadian two-dollar coin carries an image of a lone polar bear on its reverse side, while a special millennium edition featured three. , Polar bear population sizes and trends are difficult to estimate accurately because they occupy remote home ranges and exist at low population densities. Unión Internacional para a Conservación da Natureza, "List of Marine Mammal Species & Subspecies", O quecemento global fai que os oos polares pasen fame, https://gl.wikipedia.org/w/index.php?title=Oso_polar&oldid=5570617, Wikipedia:Páxinas con referencias con parámetros redundantes, Wikipedia:Todos os artigos que requiren referencias, Wikipedia:Artigos que requiren referencias desde febreiro de 2015, licenza Creative Commons recoñecemento compartir igual 3.0, Os inuit veneran o oso polar, ó que chaman.  For thousands of years, the polar bear has been a key figure in the material, spiritual, and cultural life of circumpolar peoples, and polar bears remain important in their cultures.  In the Chukchi and Beaufort seas, polar bears retreat each summer to the ice further north that remains frozen year-round.  When nervous, bears produce huffs, chuffs and snorts while hisses, growls and roars are signs of aggression. The male's ornamental foreleg hair is thought to attract females, serving a similar function to the lion's mane. As femias deféndeas mesmo fronte a un macho que mida o duplo do seu tamaño. , The Inuit and Alaska Natives have many folk tales featuring the bears including legends in which bears are humans when inside their own houses and put on bear hides when going outside, and stories of how the constellation that is said to resemble a great bear surrounded by dogs came into being. The polar bear was previously considered to be in its own genus, Thalarctos. Oso Polar (Ursus maritimus) también llamado oso blanco, es el nombre común que recibe la especie de oso que habita en el hielo ártico y en las bahías de Hudson y James, en Canadá, así como en la costa este de Groenlandia. Thawing of permafrost would affect the bears who traditionally den underground, and warm winters could result in den roofs collapsing or having reduced insulative value. However, in 2006 it imposed a limit of 150, while also allowed recreational hunting for the first time.  However, evidence of hybrids between polar bears and brown bears, and of the recent evolutionary divergence of the two species, does not support the establishment of this separate genus, and the accepted scientific name is now therefore Ursus maritimus, as Phipps originally proposed.  Around the Beaufort Sea, however, mature males reportedly average 450 kg (1,000 lb).  It can kill an adult walrus (Odobenus rosmarus), although this is rarely attempted. Pódese atopar en Alasca, no Canadá, en Groenlandia, en Rusia e no arquipélago noruegués de Svalbard. Si.  A polar bear may charge a group of walruses, with the goal of separating a young, infirm, or injured walrus from the pod. A boar (adult male) weighs around 350–700 kg (772–1,543 lb), while a sow (adult female) is about half that size.  Bears sometimes swim to Iceland from Greenland—about 600 sightings since the country's settlement in the 9th century AD, and five in the 21st century as of 2016[update]—and are always killed because of their danger, and the cost and difficulty of repatriation. These five nations are the signatories of the International Agreement on the Conservation of Polar Bears, which mandates cooperation on research and conservation efforts throughout the polar bear's range. In some areas, the polar bear's diet is supplemented by walrus calves and by the carcasses of dead adult walruses or whales, whose blubber is readily devoured even when rotten. Importing products made from polar bears had been prohibited from 1972 to 1994 under the Marine Mammal Protection Act, and restricted between 1994 and 2008. 1 Taxonomía 2 Características 2.1 Visión 2.2 Olfato 2.3 Patas 3 Esqueleto 4… O petróleo é altamente tóxico e de lenta descomposición, sendo inxerido polo animal cando este se alimenta ou executa o seu aseo. Polar bear news, and video clips from BBC programmes past and present. Esta especie é extremadamente perigosa para o home, que encara como presa, especialmente se non houber abundancia dos seus alimentos habituais. Polar bears are studied to gain understanding of what is happening throughout the Arctic, because at-risk polar bears are often a sign of something wrong with the Arctic marine ecosystem. latiu maritimus del seu nom fa referència a l'habilitat de desplaçar-se i caçar tant sobre el glaç com nedant. Common Rare Untameable Cave The Dire Bear is one of the Creatures in ARK: Survival Evolved. Por mor da súa dependencia do xeo do mar, os osos polares están clasificados como un mamíferos mariños.. Tanto as orellas como os ollos son pequenos e arredondados. Componse dunha densa capa de subpelo (5 cm) e unha capa de pelos externos (15 cm). Durante miles de anos, o oso polar foi unha figura chave na cultura material e espiritual dos pobos circumpolares, sendo aínda hoxe moi importantes nas súas culturas. According to Hoshino, the bear started running but Hoshino made it to his truck.  The polar bears that do not den on land make their dens on the sea ice. O oso polar é citado polo CITES como de baixo risco de extinción.  Polar bears are especially susceptible to Trichinella, a parasitic roundworm they contract through cannibalism, although infections are usually not fatal. A. Baker, M. E. Obbard, and B. Malloch, eds.).  Reduction in sea-ice cover also forces bears to swim longer distances, which further depletes their energy stores and occasionally leads to drowning. Español 1 641 000+ artículos. , Mature bears tend to eat only the calorie-rich skin and blubber of the seal, which are highly digestible, whereas younger bears consume the protein-rich red meat. Whereas brown bears often maul a person and then leave, polar bear attacks are more likely to be predatory and are almost always fatal. Os osos polares son animais moi preocupados coa propia hixiene. Males usually reach sexual maturity at six years; however, as competition for females is fierce, many do not breed until the age of eight or ten. , Debate over the listing of the polar bear under endangered species legislation has put conservation groups and Canada's Inuit at opposing positions; the Nunavut government and many northern residents have condemned the U.S. initiative to list the polar bear under the Endangered Species Act. , There are 19 generally recognized, discrete subpopulations, though polar bears are thought to exist only in low densities in the area of the Arctic Basin. The human-like posture of bears when standing and sitting, and the resemblance of a skinned bear carcass to the human body, have probably contributed to the belief that the spirits of humans and bears were interchangeable. Algúns animais migran desta forma do Norte para o Sur seguindo as marxes dos glaciares, mais poden desprazarse tamén por terra firme. The bear was able to reach the truck and tore one of the doors off the truck before Hoshino was able to drive off. This specimen, when mounted, stood 3.39 m (11 ft 1 in) tall on its hindlegs. Thalarctos maritimus, O oso polar (Ursus maritimus), tamén coñecido como oso branco, é un mamífero da familia dos Úrsidos. O oso polar é un animal do hemisferio norte que habita o círculo polar ártico. Only one case of a polar bear with rabies has been documented, even though polar bears frequently interact with Arctic foxes, which often carry rabies. (0.8% in the 1970s, 7.1% in the 1980s, and 14.6% in the 1990s) Nunavut polar bear biologist, Mitchell Taylor, who was formerly responsible for polar bear conservation in the territory, has insisted that bear numbers are being sustained under current hunting limits.  The mtDNA of extinct Irish brown bears is particularly close to polar bears. Italiano 1 652 000+ voci. Most polar bears elsewhere will never have access to these alternatives, except for the marine mammal carcasses that are important wherever they occur. , When the polar bear was originally documented, two subspecies were identified: the American polar bear (Ursus maritimus maritimus) by Constantine J. Phipps in 1774, and the Siberian polar bear (Ursus maritimus marinus) by Peter Simon Pallas in 1776.  He chose the scientific name Ursus maritimus, the Latin for 'maritime bear', due to the animal's native habitat. A pesar de diminuír o seu número a partir do paralelo 88°, os osos polares poden ser encontrados virtualmente en todo o Ártico. The polar bear eats seals, fish and fruits (berries). Ringed seals are born weighing 5.4 kg (12 lb) and grown to an estimated average weight of only 60 kg (130 lb). When two polar bears meet, they have a special way of greeting each other. Máis tarde, debido a interpretacións paleontolóxicas e evolutivas, foi proposta por Kurtén (1964), a integración de Phipps (1774), como a autoridade da especie.  The hollow guard hairs of a polar bear coat were once thought to act as fiber-optic tubes to conduct light to its black skin, where it could be absorbed; however, this hypothesis was disproved by a study in 1998. A última edición desta páxina foi o 25 de agosto de 2020 ás 17:44. As femias deféndeas mesmo fronte a un macho que mida o duplo do seu tamaño.  Two genes that are known to influence melanin production, LYST and AIM1, are both mutated in polar bears, possibly leading to the absence on this pigment in their fur. Para se limparen, usan as patas, a lingua, auga ou neve. Ferguson, S. H., Higdon, J. W., & Westdal, K. H. (2012). The earliest recorded birth of polar bears in captivity was on 11 October 2011 in the Toronto Zoo. ", "Determinants of Home Range Size for Polar Bears (, "Polar Bear Ursus maritimus – APPEARANCE/ MORPHOLOGY: TAIL", "Fractures of the radius and ulna secondary to possible vitamin 'D' deficiency in captive polar bears (, "Population genomics reveal recent speciation and rapid evolutionary adaptation in polar bears", 10.1644/1545-1542(2005)86[895:SDOPB]2.0.CO;2. Biologist Ian Stirling commented, "For many years, the conservation of polar bears was the only subject in the entire Arctic that nations from both sides of the Iron Curtain could agree upon sufficiently to sign an agreement. O seu nome científico significa "oso marítimo", e deriva dese feito. The United States began regulating hunting in 1971 and adopted the Marine Mammal Protection Act in 1972.  This study illustrates the polar bear's dietary flexibility but it does not represent its life history elsewhere. Historically, the polar bear has also been known as the "white bear". A dentición lembra máis a de carnívoros acuáticos que a doutros osos. O oso polar é un nadador e un corredor capaz, o que o torna un cazador eficiente tanto na auga como na terra firme. Ursus eogroenlandicus As femias están aptas para a reprodución unha vez cada tres anos, sendo un dos mamíferos con menor capacidade reprodutiva. Tendo como base feitos relativos ao cruzamento de osos pardos con osos polares, en xardíns zoolóxicos, estabeleceuse o nome Ursus (Thalarctos) maritimus para esta especie. , In Alaska, the effects of sea ice shrinkage have contributed to higher mortality rates in polar bear cubs, and have led to changes in the denning locations of pregnant females. Unlike brown and black bears, polar bears are capable of fasting for up to several months during late summer and early fall, when they cannot hunt for seals because the sea is unfrozen.  The pads of the paws are covered with small, soft papillae (dermal bumps), which provide traction on the ice.  The oldest known polar bear fossil is a 130,000 to 110,000-year-old jaw bone, found on Prince Charles Foreland in 2004. , The polar bear is found in the Arctic Circle and adjacent land masses as far south as Newfoundland.  With its body fat providing buoyancy, the bear swims in a dog paddle fashion using its large forepaws for propulsion. Due to the absence of human development in its remote habitat, it retains more of its original range than any other extant carnivore.  Large males also occasionally attempt to hunt and kill even larger prey items. It is the largest extant bear species, as well as the largest extant predatory carnivore.  Further, some clades of brown bear, as assessed by their mtDNA, were thought to be more closely related to polar bears than to other brown bears, meaning that the brown bear might not be considered a species under some species concepts, but paraphyletic. , A widespread legend tells that polar bears cover their black noses with their paws when hunting. , The polar bear is an excellent swimmer and often will swim for days. A pelaxe dos osos polares é branca e cobre todo o corpo, inclusive a planta das patas, como illamento do frío. Certas actividades humanas como a exploración de gas e petróleo, o turismo, a investigación científica e deportes na neve, perturban o animal no seu ambiente.  The polar bear's metabolism is specialized to require large amounts of fat from marine mammals, and it cannot derive sufficient caloric intake from terrestrial food.. Then they begin the long walk from the denning area to the sea ice, where the mother can once again catch seals. In 1973, the International Agreement on the Conservation of Polar Bears was signed by all five nations whose territory is inhabited by polar bears: Canada, Denmark, Norway, the Soviet Union, and the United States. Elsewhere, a slightly larger estimated average weight of 260 kg (570 lb) was claimed for adult females. The length of these swims ranged from most of a day to ten days. Nacen cegas e pesando moi pouco en relación ao peso adulto, sendo unha das crías menos desenvolvidas dos mamíferos euterios. Most maternity dens are in snowdrifts, but may also be made underground in permafrost if it is not sufficiently cold yet for snow. Some regulations of hunting did exist. The Inuit refer to the animal as nanook (transliterated as nanuq in the Inupiat language). ", Of the 19 recognized polar bear subpopulations, one is in decline, two are increasing, seven are stable, and nine have insufficient data, as of 2017. , In Russia, polar bear furs were already being commercially traded in the 14th century, though it was of low value compared to Arctic fox or even reindeer fur. Third, the recent effects of climate change have affected sea ice abundance in different areas to varying degrees.  Although ungulates are not typical prey, the killing of one during the summer months can greatly increase the odds of survival during that lean period.  In most areas, cubs are weaned at two and a half years of age, when the mother chases them away or abandons them. Constantine John Phipps was the first to describe the polar bear as a distinct species in 1774. Among young males in particular, play-fighting may be a means of practicing for serious competition during mating seasons later in life. (2011). Shifts in polar bear diet during the ice-free season in western Hudson Bay", "Predation of Svalbard reindeer by polar bears", "White-beaked dolphins trapped in the ice and eaten by polar bears", "Rejected by their mother, polar cubs now under intensive care at Toronto Zoo", "Two cubs die as mother polar bear turns on her three newborns | National Post", "Infanticide and Cannibalism of Juvenile Polar Bears (, "Long-term trends in the population ecology of polar bears in Western Hudson Bay in relation to climatic change", Polar bears, grizzlies increasingly gather on North Slope, "ABC News: Grizzlies encroaching on polar bear Country", "Clash of the fiercest predators as shark eats polar bear", "Polar bears can swim vast distances, study finds", "The vitamin A content and toxicity of bear and seal liver", "U.S. and Russia sign pact to protect the polar bear", "Circumpolar Action Plan: Conservation Strategy for Polar Bears", "Did Polar Bears Really Lose at CITES? 900 bears a year were harvested in the 1920s and after World War II, there were as many as 400–500 harvested annually. The Western Hudson Bay subpopulation is unusual in that its female polar bears sometimes wean their cubs at only one and a half years.  Polar bears have a generally polygynous mating system; recent genetic testing of mothers and cubs, however, has uncovered cases of litters in which cubs have different fathers. In their southern range, especially near Hudson Bay and James Bay, Canadian polar bears endure all summer without sea ice to hunt from. This report may well be dubious, however. Wikipedia The Free Encyclopedia.  The treaty was ratified in October 2007.  Durante décadas, a caza a grande escala supuxo unha preocupación internacional polo futuro da especie, mais as poboacións recuperáronse despois da imposición de controis.  The polar bear is among the most sexually dimorphic of mammals, surpassed only by the pinnipeds such as elephant seals. Isto débese ao feito de que a sucidade interfire coa capacidade de illamento térmico da pelaxe. Nevertheless, polar bears are listed as "Vulnerable" under criterion A3c, which indicates an expected population decrease of ≥30% over the next three generations (~34.5 years) due to "decline in area of occupancy, extent of occurrence and/or quality of habitat".  However, it is the only living marine mammal with powerful, large limbs and feet that allow them to cover kilometres on foot and run on land. The family remains in the den until mid-February to mid-April, with the mother maintaining her fast while nursing her cubs on a fat-rich milk. , Polar bears were designated "Not at Risk" in April 1986 and uplisted to "Special Concern" in April 1991.  The bears could disappear from Europe, Asia, and Alaska, and be depleted from the Canadian Arctic Archipelago and areas off the northern Greenland coast. The bears then proceeded to cache the carcasses, which remained and were eaten during the ice-free summer and autumn. , The Nenets of north-central Siberia placed particular value on the talismanic power of the prominent canine teeth. 1 Basic Info 1.1 Dossier 1.2 Behavior 1.3 Appearance 1.4 Color Scheme and Regions 1.5 Variants 1.5.1 Polar Bear 1.5.2 Dire Polar Bear 1.5.3 Spirit Dire Bear 1.6 Drops 1.7 Base Stats and Growth 2 Taming 2.1 KO Strategy 2.2 Taming Food 2.3 Preferred Food 3 Combat 3.1 General 3.2 … O hábitat natural do animal é a capa fina de xeo, onde lle é posíbel cazar focas. , Because of expected habitat loss caused by climate change, the polar bear is classified as a vulnerable species. Subadults may also be forced to accept a half-eaten carcass if they kill a seal but cannot defend it from larger polar bears. Ao nacer o fillote ten 0,6 a 0,7 kg. Then they come closer and touch noses. Ursus ungavensis Os territorios, moitas veces enormes, non son defendidos. Research of injury patterns in polar bear forelimbs found injuries to the right forelimb to be more frequent than those to the left, suggesting, perhaps, right-handedness. A cantidade de metais pesados e hidrocarburos clorados mostra unha curva ascendente en mostras de tecidos. Its hearing is about as acute as that of a human, and its vision is also good at long distances. Outra característica da súa pelaxe é non reflectir a luz ultravioleta. The baby fur of most Arctic seal species is white, presumably to provide camouflage from predators, whereas Antarctic seals all have dark fur at birth.  Partners stay together and mate repeatedly for an entire week; the mating ritual induces ovulation in the female. The killing of females and cubs was made illegal in 1965.  Satiated polar bears rarely attack humans unless severely provoked. Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation. Scientists have responded by noting that hungry bears may be congregating around human settlements, leading to the illusion that populations are higher than they actually are. , Polar bears have long provided important raw materials for Arctic peoples, including the Inuit, Yupik, Chukchi, Nenets, Russian Pomors and others. Polar bears injured in fights or accidents may either die from their injuries, or become unable to hunt effectively, leading to starvation. , The key danger posed by climate change is malnutrition or starvation due to habitat loss.  The subfamily Ursinae originated approximately 4.2 million years ago.  The 13 North American subpopulations range from the Beaufort Sea south to Hudson Bay and east to Baffin Bay in western Greenland and account for about 54% of the global population.  A third hunting method is to raid the birth lairs that female seals create in the snow. Arturo (1987 – 3 de julio de 2016) era un oso polar del Zoológico de Mendoza en Argentina y el último que se encontraba en un zoológico del país. Rising temperatures cause the sea ice to melt earlier in the year, driving the bears to shore before they have built sufficient fat reserves to survive the period of scarce food in the late summer and early fall. , With the exception of pregnant females, polar bears are active year-round, although they have a vestigial hibernation induction trigger in their blood. When walking, the polar bear tends to have a lumbering gait and maintains an average speed of around 5.6 km/h (3.5 mph). An oil spill in the Arctic would most likely concentrate in the areas where polar bears and their prey are also concentrated, such as sea ice leads. O oso polar (Ursus maritimus), tamén coñecido como oso branco, é un mamífero da familia dos Úrsidos. , When stalking land animals, such as muskox, reindeer, and even willow ptarmigan (Lagopus lagopus), polar bears appear to make use of vegetative cover and wind direction to bring them as close to their prey as possible before attacking. O pelo individual é transparente e oco. The bear may lie in wait for several hours. Government of Nunavut officials announced that the polar bear quota for the Baffin Bay region would be gradually reduced from 105 per year to 65 by the year 2013. The agreement was a rare case of international cooperation during the Cold War. Under those restrictions, permits from the United States Fish and Wildlife Service were required to import sport-hunted polar bear trophies taken in hunting expeditions in Canada.  The causes of death in wild adult polar bears are poorly understood, as carcasses are rarely found in the species's frigid habitat. The most accurate counts require flying a helicopter in the Arctic climate to find polar bears, shooting a tranquilizer dart at the bear to sedate it, and then tagging the bear.
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