Scientists believe that Ursus maritimus, the "sea bear," evolved about 200,000 years ago from brown bear ancestors. Polar bears are the world's largest land predators. They top the food chain in the Arctic, where they dine primarily on seals. Polar bears are the largest land carnivore. Male polar bears, which are called boars, grow two to three times the size of female polar bears, which are called sows. Boars weigh about 350 to more than 650 kg that's 772 -1,433 pounds, and they are about 8 ½ to 10 feet long! Sows weigh about 300 to 600 pounds and are about 6.6 to 8.2 ft. long. Pregnant females can weigh as much as 1,102 pounds! The largest polar bear ever recorded was a male weighing 2,209 pounds and measuring and enormous 12 ft. long. Compared to other bears such as the brown and black bears, polar bears have elongated bodies and long slender necks. Mostly used for swimming in the water. Their heavy fur coat can be pure white to creamy yellow to light brown depending on the season and angle of light your looking at it.
Polar bears hind limbs are longer than the forelimbs. This makes the large, muscular hind end stand higher than the shoulders. Although both there hind and forelimbs are very large and stocky. They have huge paws compared to their body size, there feet can get up to a foot in diameter. The large paws of a polar bear act like snowshoes, spreading out the bear's weight as it moves over ice and snow. They have 5-toed paws and each toe has a thick, curved, non-retractable claw. The claws are used for grasping prey and for traction when running or climbing on ice. The sole of a polar bear's foot has thick, black pads covered with small, soft papillae or dermal bumps. The papillae create friction between the foot and ice to prevent slippage. Long hairs growing between pads and toes also help prevent slipping on the ice. A polar bear's head is relatively small compared to its body size; its muzzle is elongated with a slightly arched snout.
Polar Bear's My report is on Polar Bears. The Polar Bears genus and species name is Ursus maritimus, latin for "sea bear". ... In the South, Polar Bears visit St. ... Polar bears are the largest land carnivore. The male polar bears grow two to three times the size of female polar bears. ...
The global warming could mean extinction for seabirds, walruses, and polar bears. ... The polar bears rely on the ice in order to reach the seals on which they feed. The polar bears eat very little else except ringed seals. ... The change in the ice will affect the food chain of which polar bears are a part. ... (Environment 2) Without the polar bears, the food chain would be broken. ...
Indicator Species Polar bears are one species that are currently feeling the effects of a warming climate. ... Polar bears are starving now and we need to act now to stop climate change," said Kevin Jardine, Greenpeace climate impacts specialist. ... The study reports a decline in weight of both male and female bears as well as a noticeable decline in offspring. ... Polar bears are not the only species currently under stress form a warming climate however. ... Indicator species such as polar bears and butterflies are signaling us that we are treading into uncharted waters. ...
The Act outlined four separate purposes: to conserve fish and wildlife populations and habitats in their natural diversity including, but not limited to, the Porcupine caribou herd, polar bears, grizzly bears, muskoxen, Dall sheep, wolves, wolverines, snow geese, peregrine falcons and other migratory birds and Arctic char and grayling; to fulfill the international fish and wildlife treaty obligations of the United States; to provide the opportunity for continued subsistence uses by local residents; and to ensure water quality and necessary water quantity within the refuge. ... The Refuge is al...
The refuge provides a home to many different, and nearly extinct animals including: musk oxen, caribou, migratory birds, Dall sheep, as well as grizzly, black, and polar bears; and this is just a short list. ... First, oil exploration and extraction activities are concentrated in the refuge's most critical and sensitive areas such as calving grounds for the Porcupine caribou herd and denning areas fro one of America's two polar bear populations. ... It has been reported that one in four Americans drive with seriously under inflated tires. ...
Interest first began with reports of Alaska's surface oil seeps along the arctic coast east of Point Barrow, which in 1923 was established as the 23 million acre Naval Petroleum Reserve Number 4. ... The major debate over this area began after the April 1978 Interior Department's report recommended full-scale oil development on the Coastal Plain of ANWR ("Potential Impacts..."). ... In addition, the coastal waters are home to polar bears throughout their non-dormant months, and even more importantly are the onshore denning areas of the coastal plain used during the winter months. ...
It has been known to turn male into female fish that can bear viable young. ... DDT can be sprayed here in Canada and found in the fat of a polar bear in the arctic due to bioaccumulation. ... Cases have been reported in hunting dogs in the United States and Ontario, Canada. ...
For over 230 year, the poles of the Earth have been visualized by the world as white lands without economic potential, surrounded by massive ice where only native citizens traditionally know as Eskimos, passionate scientists and specific species of animals such as polar bears, narwhals and walruses live in. ... Figure 1.1 from the Japan Aerospace Exploration Agency report (2013) reveals how over the last three decades, the summer Arctic sea ice extent has declined approximately 40 percent. ... A new investigation published in August 2012 in The United Nations Environmental Programme magazin...
East Antarctica moved into its polar position about 80 million years ago, when it was still attached to Australia; the two contents moved apart some 55 million years age. ... Along the polar front, the cold Antarctic surface water's plunge below the warmer sub-Antarctic water, marking the boundaries of Antarctic Ocean. ... Some icebergs as big as 110x75 km have been reported by explorers. ... Climate: The climatic characteristics of the Antarctic continent are determined by its polar position and its isolation . The Amundsen-Scott station of the USA , located at the geograp...
