Polar Bears by Tanya

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Polar Bears by Tanya

  1. 1. Polar Bears By Tanya
  2. 2. <ul><li>The polar bear is one of eight bear species. </li></ul><ul><li>It’s Latin name is Ursus maritimus, which means “sea bear”. </li></ul>
  3. 3. <ul><li>The polar bear is the youngest of the eight bear species. Scientists believe that the polar bear evolved about 200,000 years ago from brown bear ancestors. </li></ul>
  4. 4. <ul><li>Polar bears are the world’s largest land predators. They top the food chain in the Arctic, where they dine primarily on seals. </li></ul>
  5. 5. <ul><li>The polar bear’s main prey is the ringed seal. The ringed seal is the most numerous seal in the Arctic. </li></ul>
  6. 6. <ul><li>Adult male polar bears weigh from 775 to more than 1,500 pounds. Females are considerably smaller, normally weighing 330 to 550 pounds. </li></ul>
  7. 7. <ul><li>Adult male polar bears measure 6 ½ feet to 10 long, excluding the tail. Females measure 5 to 8 feet long, excluding the tail. </li></ul>
  8. 8. <ul><li>Polar bears range throughout the Arctic in areas where they can hunt seals at open leads. The 5 “polar bear nations” where the ice bears are found include the U.S. Canada, Russia, Denmark, and Norway. </li></ul>
  9. 9. <ul><li>Polar bears are superbly adapted for survival in the Far North. They are well-insulated against the cold, ad they are powerful enough to hunt seals successfully. </li></ul>
  10. 10. <ul><li>Scientists estimate that there are roughly 20,000 to 25,000 polar bears throughout the Arctic. </li></ul>
  11. 11. <ul><li>Polar bears have a superb sense of smell. They also have excellent hearing and eyesight. These heightened senses are necessary for survival in the changing conditions of the Arctic. </li></ul>
  12. 12. <ul><li>Polar bears are champion swimmers. They have been known to swim more than 60 miles without rest. </li></ul>
  13. 13. <ul><li>Polar bears’ forepaws are partially webbed to assist in swimming. The massive size of the forepaws measures up to 12’’ in diameter. </li></ul>
  14. 14. <ul><li>The polar bear’s fat layer, which is 3 to 4.5 inches thick, not only protects it from the cold but adds to its buoyancy in the water. </li></ul>
  15. 15. <ul><li>The polar bear’s compact ears and small tail help prevent heat loss. When curled up in a ball, they often cover their muzzles to reduce heat loss as well. </li></ul>
  16. 16. <ul><li>There is less ice than before and polar bears are seen more on land without ice. </li></ul>

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