Polar Bears Paragraph

The polar bear possesses a low, flat skull with high-sitting eyes which is best suited to a semi-aquatic life. This also benefits the Polar bear by enabling them to put their heads into puppy dens or breathing holes.

The Polar Bear (Ursus maritimus) is a bear native largely within the Arctic Circle encircling the Arctic Ocean, its surrounding seas and land masses. Although it is closely related to the Brown Bear, it has evolved to occupy a narrower ecological forte, 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. Though there are many theories surrounding evolution, the two stand outstanding hypotheses applying to the modification from Brown Bear to Polar Bear are Lamarck’s theory of Use and Disuse, and Darwin’s theory of Natural Selection. The intention of this paper is to compare these thesis and determine the most appropriate in

It was in Eurasia, within 500,000 years ago, that brown bears roamed the land. It was a time when Eurasia was found coated in ice and the Arctic ocean became it. A pack of brown bears were forced to separate for the hunt for food. It is believed that glaciers forced isolation upon the packs resulting in the deaths of many bears. Isolation was an important part of the evolution between the two bears as it forced those with an evolutionary advantage, such as the colour and thickness of their coats, to enhance these advantages and managed to survive and breed. Unlike those who were unable to cope with the environment. This generation then made new adaptations to further increase their likelihood of survival in the polar environment (PBS, 2015). For example, the bears required differently shaped teeth. As seen in the picture below, the back teeth of a polar bear are less in number and size. However, it is clear that the front teeth are larger and sharper. This is because of the change in environment forcing a change in diet for the bears; instead of eating berries the bears had to consume seals and needed sharper teeth to tear through skin. In order to camouflage themselves the bears, overtime, grew white fur to blend in with the snow. Another adaption made the these bears is the hunting technique used; at first only seal carcasses that had washed ashore were eaten by them however over time the bears

Their feet are made for the ice and snow; they have rough leather pads so they don’t slip on ice, fur between toes and sharp claws as a weapon. They are plantigrade and left handed. Their toes are webbed so they can swim in water. Their fur is a yellowish white; the top lay is long and hollow to absorb heat and can float in the water. The undercoat covers their black skin that has four inches of blubber, which is an extra layer of warmth. This kind of coat makes it uncomfortable for polar bears to be in the heat. A polar bears sense of smell is the best sense they have, they mostly rely on it. It can smell a dead whale 15 miles away, can smell where a seal is hiding in six inches of ice, and can smell a human before they could even see them. Their eyes are small to block out the sun reflecting off the snow and their ears are small, close to their heads to keep warm.

The Polar Bear are found on the icy coasts that surrounds the North Poles and as far south as Hudson Bay. Around 60%of Polar Bears can be found in Canada with the remainings throughout Greenland, Alaska, Svalbard, and Russia where tend to be close to the ocean across the icy fields. The habitats are affected by human encroachment by hunting , and releasing chemical pollutants into the water.The Polar Bear eats Seals, Walrus, and Seabirds. Polar Bears can live up to 20-30 year. Polar Bears have a lot of fur and their fur is clear, white, or yellow. The Polar Bear is 6.5 ft-8.3ft. they can weigh up to 330lbs -1,322lbs and they can swim up to 25mph.

Wild bears (Ursus arctos horribilis) have inward confronts, an unique mound on their shoulders, and long paws around two to four inches in length. Both the protuberance and the hooks are characteristics

Evolution of the Polar Bear and their relationship to the Brown Grizzly: The Controversy Continues

The polar bear is a burly white bear that lives in the lands surrounding the north pole. The polar bears is threatened species because their population is decreasing due to sea ice melting

 The polar bear has to be able to stay warm in the harsh winter cold. In fact sometimes because they have such thick fur they have to lay down on the snow to cool off so the harsh cold isnt even enough to keep them up to tempreture.

As polar bears inhabit the Arctic regions of five separate nations, it is important to examine the different nation specific management plans in place for conservation of the species. By examining the various management plans in place, a comprehensive look into polar bear management of the species on a global level may be achieved. Of the five nations with polar bear populations, the three largest have some form of a national management plan in place. However, in all five nations, all have specific polar bear hunting regulations and restrictions that also assist in polar bear preservation.

Artic Polar Bears have made many adaptations to live in the harsh climates of the Artic. These Polar Bears live in the northern areas of the world which is some of the harshest climates in the world.

The average temperature of a polar bear is 37°C, they are able to maintain this temperature by the thick  layer of fur they have, they also have a tough hide and a insulating fat layer. This insulation is able to keep the polar bear warm in temperatures that drop to -37°C. However as polar bears have a very thick layer of fat they can overheat and can die because of this, so the way they are able to keep cool is they do not travel for too long at a slow pace. Doing this stops the polar bear from overheating. If there is excess heat it will be released through the nose, ears, muzzle, footpads, thighs and shoulders as these areas do not have any fur covering it and these areas they have blood vessels which are located close to the skin. Another thing they can do to cool down

The polar bear (Ursus maritimus) is the biggest terrestrial mammal in the Arctic. He is also considered as an animal with a circumpolar or broad distribution in polar regions. The conservation status of bear remains problematic, according to the global warming that is happening now. If further managements are not implanted, polar bear population`s will disappear in the future. The polar bears live in the Arctic, an ocean surrounded by land. The Arctic has a very low species diversity and polar bears the first animal into the food chain. Also, the Arctic has cold winters which are not suitable for some aquatic species. With global warming and interglacial period, the ice and snow began to recede about 20.000 years ago. The rate of ice loss has

Their paws have soft papillae to provide a better traction on the ice as well. Their claws are short and they have small jaws with sharp teeth, which helps them to catch heavy preys, such as seals. Another obvious difference between the two species is the colour of their coats. The arctic is a harsh environment filled with barren white landscapes. The polar bears ancestors, the brown bear, primarily lived in woods around northern America and Europe where their brown fur helped them to camouflage with the brown-forest environment.

the last thirty years three quarters of floating ice cover has been lost, which has greatly affected the Polar Bears. This has been due to our use of fossil fuels. This photograph was captured in order to send the message that Polar Bears are losing their homes on the rapidly melting ice caps due to global warming and change has to be done.