Polar Bear

Pranavi Challagonda Period 8 5/16/16

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Habitat

Polar Bears are usually found in arctic regions.They are not able to hide when it is hunting season because they don't have trees or big bushes(Eleanor J Hall).The Arctic is an icy spot at the top of the globe. Lately the temperature in the polar region has been on the rise, putting the people and animals that live there at risk(Johnna Rizzo). The polar regions are the parts of Earth surrounding the North and South Poles. The Arctic region is in the north and the Antarctic in the south. The polar regions are cold year-round. These regions include the polar ice sheets on Greenland in the Arctic and the continent of Antarctica, as well as polar ice caps(Polar Regions).

Movement

Polar bears are able to swim up to 20-30 miles at a time period. As the ice pack pulls farther and farther from land, scientists worry that polar bears are losing valuable energy in longer swims. In fact, one research team recorded a female's journey in 2008. In a single swim, the bear traveled more than 400 miles. She then walked and swam another 1,100 miles. By the end, she had lost one-fifth of her body weight(Going the Distance Scientists like Anthony Pagno are working to help polar bears).

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Body Covering

Underneath their fur they have black skin.Polar bears' fur consists of a dense, insulating underfur topped by guard hairs of various lengths. It is not actually white—it just looks that way.Each hair shaft is pigment-free and transparent with a hollow core that scatters and reflects visible light, much like what happens with ice and snow.

Polar bears look whitest when they are clean and in high angle sunlight, especially just after the molt period, which usually begins in spring and is complete by late summer. Before molting, accumulated oils in their fur from the seals they eat can make them look yellow.Skin. Polar bears have black skin under which there is a layer of fat that can measure up to 4.5 inches (11.5 centimeters) thick.On land (or on top of the sea ice) the polar bear's thick fur coat—not its fat—prevents nearly any heat loss. In fact, adult males can quickly overheat when they run.In the water, polar bears rely more on their fat layer to keep warm: wet fur is a poor insulator. This is why mother bears are so reluctant to swim with young cubs in the spring: the cubs just don't have enough fat.

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Diet

The bears can smell their prey's 0.6 miles away. Polar bear

are

strictly carnivores and feed or scavenge only meat. Their primary prey is the ringed seal though they also take

bearded

harp and hooded seals and the occasional walrus youngster. They will also scavenge walrus and whale carcasses. That sometimes results in temporary aggregations of Polar bears at such sites. Other species, such as the Arctic fox, rely entirely upon " bear left-overs" after the bears have eaten their fill of seal skin and blubber, leaving the remaining meat for such scavengers(Going the Distance Scientists like Anthony

Pagno

are working to help polar bears).

Reproduction

Female polar bears reach sexual maturity around 4-5 years old. While male polar bears reach sexual maturity around 6 years old. Male bears don't mate until they are around 8-10 years old.Breeding seasons are around March-June. Competition for female bears is intense because they only mate every three years .Before mating there is a tough fierce fight to mate with the female bear.Mostly the strongest and toughest male polar bear wins (Polar Bear's).
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Adaptations

Polar bears are strong swimmers, they swim across bays trying to find food.Polar Bears migrate like birds but to the cold and they walk.Except for a brief courtship in summer, Polar Bears are solitary. Males and nonpregnant females are thought to wander all winter. A pregnant female makes a winter den in the snow soon two tiny, helpless cubs are born in January and nursed in the den until March. They usually remain with the mother for about a year and a half, while learning to hunt(polar bear).
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Other Info

  • Polar Bears have black skin under their coat
  • Seals make up most of their diet
  • Female bears use old snow to make her den
  • Polar Bear cubs learn to freeze while their mother is hunting
  • Polar Bears do not hibernate
  • Polar Bears are so strong that it can kill anything below it with its paw
  • Only humans kill Polar Bears
  • Polar Bears tend to heat more than getting cold
  • They have 42 teeth
  • Spend most of their life at sea

  • Largest carnivore on land
  • Their scientific name means Sea Bear
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Works Cited