Polar Bears (Ursus maritimus) is a bear species found inhabiting areas of ice in the Arctic Ocean. The polar bear is the world's largest bear species, weighing bear males can reach 600kg. Considered to be closely related to the Brown Bear (Brown Bear), the polar bear is also often referred to as "Bear Sea (Sea Bear)" because it is known not only spend a lot of time close to the beach, but also a strong swimmer and is able to look up to 100 miles of ice nearby or the mainland. The existence of polar bears heavily influenced by global warming because their habitats are composed of ice will disappear if global warming continues. Therefore polar bears became a potent symbol of the impact of climate change. The population of Polar Bear also has declined dramatically in Arctic Ocean due to poaching, pollution and drilling of oil and gas that causes them endangered.

Adult polar bears can reach more than two meters high and weighing about half a ton. While the weight of female polar bears are much lighter than the male bear can weigh twice as much weight. The polar bear is one of the few large mammals are found to have adapted well to survive in the glacier. Their thick fur, long and dense growing on a hollow tube that is useful sabagai absorbing heat from the sun to warm themselves. Polar bears have a strong body and muscular with broad front legs which help them when swimming in the water. Hair that is at the bottom of their feet not only help keep their feet warm but also facilitate the polar bear as it moves on the ice. They have a very long neck compared with other bear species that allow their heads to remain above water while swimming. They also have a longer snout and ears are smaller than their relatives other bears.

Polar bears are found in the coastal ice surrounding the North Pole and South along the Hudson Bay. Approximately 60% of the polar bear can be found in northern Canada and the rest are all over Greenland, Alaska, Svalbard and Russia. The polar bear population has fallen drastically with their biggest threat is global warming. Although polar bears are accustomed to seasonal changes in the Arctic circle, but after its global warming, the melting of ice in the summer is greater from year to year. This means that the polar bear will lose their natural habitat. In addition to global warming, perburan and pollutants contaminating the water around their habitat are also contributing to the drop in the population of polar bears.

Polar bears are solitary animals (solitary) that not only can run at speeds up to 25 meters per hour but also the ability of swimming strong up to 6 meters per hour making it a top predator in the environment. Semi-aqautic mammals are able to hunt well on the ice and in the water and have been known to swim in the vast distances in the open ocean in search of food. Polar bears can dive under water to catch prey, which they do by keeping their eyes open and holding their breath for up to two minutes. On land, they tend to hunt using two main techniques, namely the pursuit of their prey or wait to sit beside the nest hole seals up for hours to catch seals appear. Eat seals is vital to the survival of polar bears because the meat seals capable of providing high energy intake.

Polar bears tend to breed in the spring between April and May with a gestation period varies (depending on the health of females). After 9 months of pregnancy, females give birth to between 1 and 4 children in the nest that they had dug into the snow or soil. Polar bear cub can weigh more than half a kilo when they are born. Polar bear cub also own hair and can not see. Female enters the nest towards the end of autumn and will come out when it has turned into spring. Although the polar bear cub has been able to start eating solid foods when they are about 5 months old, they are not separated by their mothers until the age of 2 to 3 years.

The polar bear is the largest terrestrial carnivorous mammals and must hunt regularly to ensure their food reserves sufficient to maintain the insulating layer of fat to keep warm. Skin and fat from the seals are fine dining polar bears. The polar bear is also often seen leaving the remaining meat becomes important food source for other animals such as Arctic fox. Although seals are the main source of their food, polar bears also eat birds, fruits, fish and deer (especially during the summer months) and with occasional Walrus. Carcasses of large marine mammals including walrus and even the Pope also provide a source of food for polar bears. With their sense of smell is excellent, they were able to sniff out food from a considerable distance. Polar bears are also known to get into the nest underground seals to hunt.

Because polar bears merpuakan large predators and fierce, no animals that prey on them in the environment around them. One of the threats polar bears are humans because they have a voracious hunt polar bears from their arrival in the Arctic Ocean in the 1600s until the mid-1970s. But now, the ban on hunting has been applied. Glacier is very important for the survival of polar bears. The melting glacier caused by climate change, have a major impact on reducing the polar bear population. In addition, the polar bear has a relatively slow rate of reproduction. Some experts claim that polar bears could be extinct in the wild within 30 years.

Before entering the harsh winter and even, the polar bear females dig their own nest in the snow where they will hibernate (winter sleep) during ber months (and where they give birth to their child) and will only reappear in the spring. Nest polar bears are known to forty degrees warmer than outside. However, male polar bear seems to prefer to be active throughout the year. The polar bear has a layer of fat under their skin which can be up to 4 inches thick to help them to keep warm. They are actually very well insulated, that the polar bear must move slowly for most of the time so they do not overheat. Polar bears will be knocked out of their fur in the summer. It causes the fur of polar bears look more white in the early autumn. Sedagnkan in the spring, their fur coat looks more yellow. The yellow color in the can of oil seals they eat.

Currently, the polar bear has been listed in the 'Red List' IUCN as endangered species. Although an international hunting ban has been set, but the hunting of polar bears is still rife. Conservation efforts in the Arctic Circle became difficult because the original habitat of the polar bear (glacier) that were increasingly shrinking due to global warming. Increased levels of industrial activity in their natural environment also led to a decrease in the quality of their remaining habitat. It is estimated that between 20000-25000 polar bears are still left with the majority of these are found in northern Canada.