Polar Bear
Introduction
Polar bears live in the Arctic Circle with temperatures that can be minus fifty degrees Celsius. Polar bears are considered marine mammals because they spend the majority of the life at sea, swimming for miles, but they are the only marine mammal that has limbs and also roams on ice and land. Male polar bears generally are twice the size of females, or sow’s. An ancestor of the grizzly bear, polar bears live in the Arctic Circle and spend majority of their time in the ocean hunting for seals. Seals being the meal of choice for polar bears they have adapted to the harsh climate and learned how to hunt seals (Willmer, 2004). The population size of polar bears is uncertain but Canada is responsible for two
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Along with being translucent the bears fur is also hollow, this helps the bear swim, also preventing the freezing water from touching the bears skin. The bears fur is also long, fine and densely packed insulating the bear further (Willmer, 2004). The polar bear have large feet and the soles are covered in fur, insulating the feet and also used as grip for walking on the ice and snow. The large feet surface area on their feet also serves as grip for walking long distances searching for food. They also have small ears which decrease risk of water getting in them. The small ears also reduce heat loss.
Diet
Polar bears are the most carnivorous of the bear family. Polar bears have large narrow heads allowing them to fit there heard in small spaces searching for food. They have a great sense of smell allowing them to sniff out predators form far away. They have the most sensitive nose of any mammal this allows them to smell a seal that is three feet under the snow, or thirty kilometers away. When they do find a seal den they jump and push all their body weight into the snow breakings free the seal from underneath the ice. This hunting tactic mastered by polar bears acts as a surprise attack, and the seal never knew what was coming. These bears incredible sense of smell allows them to pin point the exact spot where the seal’s den is under the ice, otherwise if the polar bear is wrong the hunt will not be successful. This method is so important because the
The melting sea ice is also affecting the polar bear's main prey, seals, forcing the bears to turn to alternate, less nutritious food sources. Once sea ice forms in the winter, seals use the ice to create dens to give birth to their pups. In these months, polar bears use sea ice as their hunting grounds to find seal dens. Now that Seasonal Ice is forming later and melting earlier (IPCC, 2013), seals have less time to build dens and give birth. Consequently, polar bears have less time to hunt their preferred prey of seal pups. They must spend more time on land hunting other animals of less nutritional value. Organizations like Sea World Parks have reported male polar bears occasionally eating newly-born polar bear cubs because they cannot find other food to eat. Lack of nutritional food leads to a reduced body size. Polar bears are becoming thinner and weaker from not eating enough (Rode, Amstrup, & Regehr 2010). They have to swim longer distances to find ice to hunt upon, causing many cubs to die because they are not yet strong enough. In the Hudson Bay, the average polar bear weight has decreased by 15% and the population has decreased by 20% (National Wildlife Federation). In the summer when there is no ice, polar bears in the Hudson Bay go onto land to fast until the ice reforms. Now that ice is
White bears require a variety of physical characteristics to survive in the harsh environment of the Arctic. Large, wide paws with bumps allow them to distribute weight and grip more efficiently. Water resistant fur with a luminescent quality keep the bear warm and dry. Additionally, Sharp and powerful teeth have the ability to penetrate hard flesh. These special features allow not only the ability to thrive in a difficult environment, but also are important for communicating with other species and another bear.
Polar Bears have dens that tend to be 40 degrees warmer than outside. They has very thick blubber
Scientists say that the melting of Arctic ice and ice caps are harmful to essential life of arctic animals like polar bears because they live on Arctic ice and ice caps (Rinkesh). Research has proven both of these theories wrong. The Arctic ice and ice caps have increased and are still increasing. Since 2012, the Arctic ice and ice caps have increased in volume by fifty percent (Foley). There are over twenty thousand polar bears in the world and over sixty percent of these polar bears live in Canada (Matishov). The population of polar bears is increasing and staying at a stable rate, depending on their location (Global Warming and Polar Bears). Since, both of these theories have been proven wrong, we do not believe that “global warming” is affecting the Arctic ice or Arctic
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
Scientists recognize the Brown bear as the correct common name for the species. Brown bears are found in Canada, the United States, and across northern Europe and Asia. Polar bears are Ursus maritimus and they are found along the northern coasts and the arctic waters north of Alaska, Canada, Greenland, Norway, and Russia. The overlap of the two species in North America is in the arctic region of northeastern Alaska and northwestern Canada. However, with the change in the climate, brown bears are expanding their range northward to new areas previously occupied by polar
The bears in Alaska rarely have people near them so they eat berries and whatever they can find. " Polar bears can live anywhere they find food and they prefer the area they were born." (Ned Rozell) Eating a polar bear's liver can kill you because it contains so much Vitamin A that humans can't handle. "
Polar bears live in the Arctic near large portions of ice found in the Arctic Ocean. Due to global warming, these species are forced to remain on coastlines or get stranded on small pieces of
The polar bear lives up in the Arctic region where global warming and climate change are melting the ice caps that the bears thrive on. They use the ice as a platform from hunting and rest. The random pocket holes in the ice, where the seals pop up at, is where the polar bear catches its prey. With this reduction of ice, “the abundance of seals, and increases the amount of energy and time needed for hunting, leaving less energy for reproduction” (Endangered Species and Habitats).
The Arctic ice is slowly melting away and this is really hurting the polar bear population. This weather change is causing the polar bears to have a big diet change. They are now catching less seals but they are traveling a greater distance across the ice. This means they are not gaining a lot of energy even though they are using a lot by moving long distances. Researchers used collars with cameras and a GPS inside of it to find more detail on how polar bears are behaving and what they have to do to survive.
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.
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.
The females weigh less than the males. The bottom of their feet give them grip and helps them to move around. The female polar bears dig a hole in the snow to survive the hostile months and the give birth there and it is called a den. The polar bears are aggressive toward humans.
In the Arctic Ice Sheets polar bear roams the wilderness. There may be other bears in the arctic, but the polar bear is the largest land carnivore in the wilderness. The polar bear may look like any other bear, but they are different. Now since the ice caps are melting the polar bear are in great threat of going extinct.