Grizzly Bear vs. Polar Bear
Polar Bear Facts
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Ursus eogroenlandicus Ursus groenlandicus Ursus jenaensis Ursus labradorensis Ursus marinus Ursus polaris Ursus spitzbergensis Ursus ungavensis Thalarctos maritimus. The polar bear Ursus maritimus is a carnivorous bear whose native range lies largely within the Arctic Circleencompassing the Arctic Oceanits surrounding seas and surrounding land masses. It is a large bear, approximately the same size as the omnivorous Kodiak bear Ursus arctos middendorffi. Although it is the sister species of the brown bear it has evolved to occupy a narrower ecological nichewith many body characteristics adapted for cold temperatures, for moving across snow, ice and open water, and for hunting sealswhich make up most of its diet.
Their scientific name means " maritime bear" and derives from this fact. Polar bears hunt their preferred food of seals from the edge of sea iceoften living off fat reserves when no sea ice is present. Because of their dependence on the sea ice, polar bears are classified as marine mammals.
How Much Does a Polar Bear Weigh? – Polar Bear Weight
Because of expected habitat loss caused by climate changethe polar bear is classified as a vulnerable speciesand at least three of the nineteen polar bear subpopulations are currently in decline. Historically, the polar bear has also been known as the white bear. Constantine John Phipps was the first to describe the polar bear as a distinct species in The Inuit refer to the animal as nanook transliterated as nanuq in the Inupiat language.
The polar bear was previously considered to be in its own genusThalarctos. The bear familyUrsidaeis thought to have split from other click here about 38 million years ago.
How big is a polar bear?
The evidence from DNA analysis is more complex. However, the two species have mated intermittently for all that time, most likely coming into contact with each other during warming periods, when polar bears were driven onto land and brown bears migrated northward.
Most brown bears have about 2 percent genetic material from polar bears, but one population, the ABC Islands bears has between 5 percent and 10 percent polar bear genes, indicating more frequent and recent mating.
When the polar bear was originally documented, two subspecies were identified: Ursus maritimus maritimus by Constantine J.
How Much Does a Polar Bear Weigh?
Phipps inand Ursus maritimus marinus by Peter How Much Does A Polar Bear Weight Pallas in Ursus maritimus tyrannus became extinct during the Pleistocene. The polar bear is found in the Arctic Circle and adjacent land masses as far south as Newfoundland. Due to the absence of human development in its remote habitat, it retains more of its original range than any other extant carnivore. Their southernmost range is near the boundary between the subarctic and humid continental climate zones.
It is difficult to estimate a global population of polar bears as much of the range has been poorly studied; however, biologists use a working estimate of about 20—25, or 22—31, polar bears worldwide. 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 range includes the territory of five nations: These five nations are the signatories of the International Agreement on the Conservation of Polar Bearswhich mandates cooperation on research and conservation efforts throughout the polar bear's range.
Modern methods of tracking polar bear populations have been implemented only since the mids, and are expensive to perform consistently over a large area.
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. Of the 19 recognized polar bear subpopulations, three are declining, six are stable, one is increasing, and nine have insufficient data, as of The polar bear is a marine mammal because it spends many months of the year at sea.
These areas, known as the "Arctic ring here life", have link biological productivity in comparison to the deep waters of the high Arctic. Polar bears are able to produce water through the metabolism of fats found in seal blubber. Annual ice contains areas of water that appear and disappear throughout the year as the weather changes.
Seals migrate in response to these changes, and polar bears must follow their prey. The only other bear similar in size to the polar bear is the Kodiak bearwhich is a subspecies of brown bear. Compared with its closest relative, the brown bear, the polar bear has a more elongated body build and a longer skull and nose.
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. The 42 teeth of a polar bear reflect its highly carnivorous diet. The white coat usually yellows with age. When kept in captivity in warm, humid conditions, the fur may turn a pale shade of green due to algae growing inside the guard hairs.
The male's ornamental foreleg hair is thought to attract females, serving a similar function to the lion's mane. The polar bear has an extremely well developed sense of smellbeing able to detect seals nearly 1. The polar bear is an excellent swimmer and often will swim for days. When walking, the polar bear tends to have a lumbering gait and maintains an average speed of around 5. Unlike brown bears, polar bears are not territorial. Although stereotyped as being voraciously aggressive, they are normally cautious in confrontations, and often choose to escape rather than fight.
Polar bears are stealth hunters, and the victim is often unaware of the bear's presence until the attack is underway. Michio Hoshinoa Japanese wildlife photographer, was once pursued briefly by a hungry male polar bear in northern Alaska.
Because of their dependence on the sea ice, polar bears are classified as marine mammals. Fish and Wildlife Service. Polar bear were hunted heavily in Svalbard, Norway throughout the 19th century and to as recently aswhen the conservation treaty was signed.
According to Hoshino, the bear started running but Click here made it to his truck. The bear was able to reach the truck and tore one of the doors off the truck before Hoshino was able to drive off. In general, adult polar bears live solitary lives. Yet, they have often been seen playing together for hours at a time and even sleeping in an embrace,  and polar bear zoologist Nikita Ovsianikov has described adult males as having "well-developed friendships.
Among young males in particular, play-fighting may be a means of practicing for serious competition during mating seasons later in life.
Females communicate with their young with moans and chuffs, and the distress calls of both cubs and subadults consists of bleats. Ina photographer near Churchill took a now widely circulated How Much Does A Polar Bear Weight of photographs of a polar bear playing with a Canadian Eskimo Dog Canis lupus familiaris a tenth of its size.
The polar bear is the most carnivorous member of the bear family, and throughout most of its range, its diet primarily consists of ringed Pusa hispida and bearded seals Erignathus barbatus. The polar bear's most source hunting method is called still-hunting: The bear may lay in wait for several read more. When the seal exhales, the bear smells its breath, reaches into the hole with a forepaw, and drags it out onto the ice.
The polar bear kills the seal by biting its head to crush its skull. The polar bear also hunts by stalking seals resting on the ice: A widespread legend tells that polar bears cover their How Much Does A Polar Bear Weight noses with their paws when hunting. This behaviour, if it happens, is rare — although the story exists in the oral history of northern peoples and in accounts by early Arctic explorersthere is no record of an eyewitness account of the behaviour in recent decades. 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.
Subadults may also be forced to accept a half-eaten carcass if they kill a seal but cannot defend it from larger polar bears. After feeding, polar bears wash themselves with water or snow. Although polar bears are extraordinarily powerful, its primary prey species, the ringed seal, is much smaller than itself, and many of the seals hunted are pups rather than adults. Ringed seals are born weighing 5. A polar bear may charge a group of walruses, with the goal of separating a young, infirm, or injured walrus from the pod.
They will even attack adult walruses when their diving holes have frozen over or intercept them before they can get back to the diving hole in the ice. Yet, polar bears will very seldom attack full-grown adult walruses, with the largest male walrus probably invulnerable unless otherwise injured or incapacitated.
Since an attack on a walrus tends to be an extremely protracted and exhausting venture, How Much Does A Polar Bear Weight have been known to back down from the attack after making the initial injury to the walrus. The whales are of similar size to the walrus and nearly as difficult for the bear to subdue. 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. With the exception of pregnant females, polar bears are active year-round,  although they have a vestigial hibernation induction trigger in their blood.
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. Being both curious animals and scavengers,   polar bears investigate and consume garbage where they come into contact with humans.
Although seal predation is the primary and an indispensable way of life for most polar bears, when alternatives are present they are quite flexible. Polar bears consume a wide variety of other wild foods, including muskox Ovibos moschatusreindeer Rangifer tarandus birds, eggs, rodentscrabsother crustaceans and other polar bears.
They may also eat plants,  including berriesrootsand kelp ; learn more here however, none of these have been a significant part of their diet,  except for beachcast marine mammal carcasses. Given the change in climate, with ice breaking up in areas such as the Hudson Bay earlier than it used to, polar bears are exploiting food resources such as snow geese and eggs, and plants How Much Does A Polar Bear Weight as lyme grass in increased quantities.
Polar bears have been observed to hunt the small Svalbard reindeer R. Like the brown bear, most ungulate prey of polar bears is likely to be young, sickly or injured specimens rather than healthy adults. In their southern range, especially near Hudson Bay and James BayCanadian polar bears endure all summer without sea ice to hunt from.
They still manage to consume some seals, but they are food-deprived in summer as only marine mammal carcasses are an important alternative without sea ice, especially carcasses of the beluga whale. These alternatives may reduce the rate of weight loss of bears when on land.
They were also diving to feed on blue mussels and other underwater food sources like the green sea urchin. Most polar bears elsewhere will never have access to these alternatives, except for the marine mammal carcasses that are important wherever they occur. In Svalbard, polar bears were observed to kill white-beaked dolphins during spring, when the dolphins were trapped in the sea ice.
The bears then proceeded to cache the carcasses, which remained and were eaten during the ice-free summer and autumn. Courtship and mating take place on the sea ice in April and May, when polar bears congregate in the best seal hunting areas.
Crocuta Spotted hyena C. Impact of a Warming Arctic: The polar bear is the apex predator within its range, and is a http://hnusta.info/se/how-to-get-your-boyfriend-to-commit.php species for the Arctic. Member countries agreed to place restrictions on recreational and commercial hunting, ban hunting from aircraft and icebreakers, and conduct further research. A lb bear can lbs worth of food in a single meal.
After mating, the fertilized egg remains in a suspended state until August or September. When the ice floes are at their minimum in the fall, ending the possibility of hunting, each pregnant female digs a maternity den consisting of a narrow entrance tunnel leading to one to three chambers. In the den, she enters a dormant state similar to hibernation. This hibernation-like state does not consist of continuous sleeping; however, the bear's heart rate slows from 46 to 27 beats per minute.
Between November and February, cubs are born blind, covered with a light down fur, and weighing less than 0. The earliest recorded birth of polar bears in captivity was on 11 October in the Toronto Zoo. Female polar bears are noted for both their affection towards their offspring, [ citation needed ] and their valor in protecting them.