Anonymous
Anonymous asked in Science & MathematicsBiology · 1 decade ago

Polar bears?

Whats a special adaption that polar bears have and what is it used for?

And what's an interesting fact about them?

Thank you =]

4 Answers

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  • Dan S
    Lv 7
    1 decade ago
    Favorite Answer

    Polar Bears do NOT have white fur, it is clear. One incident in a zoo had a form of algae infect their polar bears turning them green.

    Polar bears do not hibernate; they sleep most of the winter, but they wake up frequently. Most bears give birth during the winter, as do polar bears.

    According to Wikipedia; http://en.wikipedia.org/wiki/Polar_Bear

    "The polar bear (Ursus maritimus) is a bear native to the Arctic Ocean and its surrounding seas. The world's largest predator found on land, an adult male weighs around 300–600 kg (660–1,300 lb), while an adult female is about half that size. Although it is closely related to the brown bear, it has evolved to occupy a narrow ecological niche, with many body characteristics adapted for cold temperatures, for moving across snow, ice, and open water, and for hunting the seals which make up most of its diet. As it can hunt consistently only from sea ice, the polar bear spends much of the year on the frozen sea, although most polar bears are born on land.

    The polar bear is classified as a vulnerable species. Of the 19 recognized polar bear subpopulations, 5 are declining, 5 are stable, 2 are increasing, and 7 have insufficient data. For decades, unrestricted hunting raised international concern for the future of the species; populations have rebounded after controls and quotas began to take effect. For thousands of years, the polar bear has been a key figure in the material, spiritual, and cultural life of Arctic indigenous peoples, and the hunting of polar bears remains important in their cultures.

    The IUCN now lists global warming as the most significant threat to the polar bear, primarily because the melting of its sea ice habitat reduces its ability to find sufficient food. The IUCN states, "If climatic trends continue polar bears may become extirpated from most of their range within 100 years." On May 14, 2008, the United States Department of the Interior listed the polar bear as a threatened species under the Endangered Species Act....

    The polar bear is the largest predator that lives on land, being twice as big as a lion or tiger.... The largest polar bear on record, reportedly weighing 1,002 kg (2,210 lb), was a male shot at Kotzebue Sound in northwestern Alaska in 1960....

    Polar bear fur consists of a layer of dense underfur and an outer layer of guard hairs, which appear white to tan but are actually translucent. The guard hair is 5–15 cm (2.0–5.9 in) over most of the body...

    Polar bears gradually moult from May to August, but, unlike other Arctic mammals, they do not shed their coat for a darker shade to camouflage themselves in the summer conditions. 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 theory was disproved by recent studies. The white coat usually yellows with age. When kept in captivity in warm, humid conditions, it is not unknown for the fur to turn a pale shade of green due to algae growing inside the guard hairs.[38] Males have significantly longer hairs on their forelegs, that increase in length until the bear reaches 14 years of age. The male's ornamental foreleg hair is thought to attract females, serving a similar function to the lion's mane...

    Polar bears still have a vestigial hibernation induction trigger in their blood, but they do not hibernate in the winter as the brown bear does. Only female polar bears enter a dormant state (referred to as "denning") during pregnancy, though their body temperature does not decrease during this period as it would for a typical mammal in hibernation...

    Unlike grizzly 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. Fat polar bears rarely attack humans unless severely provoked, whereas hungry polar bears are extremely unpredictable and are known to kill and sometimes eat humans...

    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."...

    Females begin to breed at the age of four years in most areas, and five years in the Beaufort Sea area.[58] 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....

    Polar bears are especially susceptible to Trichinella, a parasitic roundworm they contract through cannibalism. Bacterial Leptospirosis, rabies and Morbillivirus have been recorded. The bears are thought by some to be more resistant than other carnivores to viral disease....

    The Soviet Union banned all harvest of polar bears in 1956, however poaching continued and is believed to pose a serious threat to the polar bear population.[4] In recent years, polar bears have approached coastal villages in Chukotka more frequently due to the shrinking of the sea ice, endangering humans and raising concerns that illegal hunting would become even more prevalent."

    Not only are these facts correct, but I have proof to show it.

  • 1 decade ago

    "Each hair of a polar bear's coat is hollow and transparent, helping to draw the sun's rays toward the bear's black skin."

    I think this is amazing!

  • 1 decade ago

    um they hav white fur so their prey cant easily spot them cuz they blend in with the snow =] their fur isnt actually white. really it's tiny clear tubes and the sunlight reflects off it and ice and snow making it appear white. hope that helps

  • 1 decade ago

    there fur is white and helps them hunt

    Source(s): Remeber pick me as best lol my answer sucks
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