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The polar bear is a bear native largely within the Arctic Circle . It is the world"s largest land carnivore. Polar bears roam the Arctic ice sheets and swim in that region"s coastal waters. They are very strong swimmers, and their large front paws, which they use to paddle, are slightly webbed. Some polar bears have been seen swimming hundreds of miles from land—though they probably cover most of that distance by floating on sheets of ice.
Polar bears live in one of the planet"s coldest environments and depend on a thick coat of insulated fur, which covers a warming layer of fat. Fur even grows on the bottom of their paws, which protects against cold surfaces and provides a good grip on ice. The bear"s stark white coat provides camouflage in surrounding snow and ice. But under their fur, polar bears have black skin—the better to soak in the sun"s warming rays.
These powerful predators typically prey on seals. In search of this quarry they frequent areas of shifting, cracking ice where seals may surface to breathe air. They also stalk ice edges and breathing holes. If the opportunity presents itself, polar bears will also consume carcasses, such as those of dead whales. These Arctic giants are the masters of their environment and have no natural enemies.
Females den by digging into deep snow drifts, which provide protection and insulation from the Arctic elements. They give birth in winter, usually to twins. Young cubs live with their mothers for some 28 months to learn the survival skills of the far north. Females aggressively protect their young, but receive no help from their solitary male mates. In fact, male polar bears may even kill young of their species.
Polar bears are attractive and appealing, but they are powerful predators that do not typically fear humans, which can make them dangerous. Near human settlements, they often acquire a taste for garbage, bringing bears and humans into perilous proximity.
coco-
Polar bears are in danger
The polar bear is the world"s largest land predators, also known as the arctic. According to the classification of zoology BuRuGang, XiongKe. Male polar bears length about 240-260cm, weight is commonly 400-800 kilograms. The female polar bear form about than males little about half, height, weight 210cm about 190 - about 200-300 kg. In winter sleep time coming before, because fat will accumulate a huge number, they weigh up to 800 kilograms. The polar bear"s vision and hearing and human subjects, but their sense of smell is dogs sniff, seven times, speeds up to 60 kilometers, is the world 100 meters champion of 1.5 times.
Polar bears are one of nature"s most beautiful animals, but their home—the Arctic North—is in danger.
Environmental pollution leading to polar bears are hermaphrodite
Wildlife researchers have found new evidence, because of global warming are seriously threatened habitats of polar bears, now again by chemical compounds harm.
These compounds is mainly European used to reduce sofa, clothes and carpet etc household combustible toxic chemicals. From Canada, the United States Alaska, Denmark and Norway, a group of scientists is warning they recently found that an enzyme called bromine biphenyl (more than PBDEs) of flame retardants began to appear in the polar bear adipose tissue, especially life in east Greenland and Norway sasha anwar the gilbert islands polar bears.
About these chemicals can to polar bears what impact, research is still in progress. But in mice test showed that these toxic chemicals for animal"s influence is considerable, including their gender, thyroid, sports skills and brain function.
There is evidence that those and more bromine biphenyl of similar compounds leads to the amazing proportions of hermaphrodite polar bears. In gaza anwar gilbert islands, about every 50 only female bear 1 in only two organ in length, the scientists will this directly linked with pollution.
"Global natural foundation leaders colin - butterfield said:" the arctic is now a chemical receiver. We daily use products that occupy the home is polluting chemicals in arctic wildlife." These polluting substances mainly come from the United States and Western Europe and other developed industrial area, water flow and north decent practice takes them arctic, in the arctic cold climate accumulation down and introduced into the food chain, and suffer the biggest is the polar bear.
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According to IUCN"s(世界自然保护联盟的) recent Red List of Threatened Species（受到威胁的物种）, the polar bear is listed as a “vulnerable” species that is threatened with extinction（灭绝）.
With its clean lines and white fur, the polar bear has an aesthetic appeal that"s thoroughly modern.Ever since we saw those bears stuck on melting ice in Al Gore"s An Inconvenient Truth,we hear the sad screams of a baby polar bear ringing in the back of our minds.
We should try our best to help Polar bears out of danger.
LocCloud-
Polar bears are in danger
The polar bear is the world"s largest land predators, also known as the arctic. According to the classification of zoology BuRuGang, XiongKe. Male polar bears length about 240-260cm, weight is commonly 400-800 kilograms. The female polar bear form about than males little about half, height, weight 210cm about 190 - about 200-300 kg. In winter sleep time coming before, because fat will accumulate a huge number, they weigh up to 800 kilograms. The polar bear"s vision and hearing and human subjects, but their sense of smell is dogs sniff, seven times, speeds up to 60 kilometers, is the world 100 meters champion of 1.5 times.
Polar bears are one of nature"s most beautiful animals, but their home—the Arctic North—is in danger.
Environmental pollution leading to polar bears are hermaphrodite
Wildlife researchers have found new evidence, because of global warming are seriously threatened habitats of polar bears, now again by chemical compounds harm.
These compounds is mainly European used to reduce sofa, clothes and carpet etc household combustible toxic chemicals. From Canada, the United States Alaska, Denmark and Norway, a group of scientists is warning they recently found that an enzyme called bromine biphenyl (more than PBDEs) of flame retardants began to appear in the polar bear adipose tissue, especially life in east Greenland and Norway sasha anwar the gilbert islands polar bears.
About these chemicals can to polar bears what impact, research is still in progress. But in mice test showed that these toxic chemicals for animal"s influence is considerable, including their gender, thyroid, sports skills and brain function.
There is evidence that those and more bromine biphenyl of similar compounds leads to the amazing proportions of hermaphrodite polar bears. In gaza anwar gilbert islands, about every 50 only female bear 1 in only two organ in length, the scientists will this directly linked with pollution.