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Transcript of Polar Bears
The Polar Bear
Since the Polar Bear lives in the Arctic, they eat mostly ringed and bearded seals.
Depending on where they are located, they could also eat harp and hooded seals.
Polar Bears live mainly in Alaska, Canada, Russia, Greenland and Norway.
They dont live in places where they can't get through the openings in the ice (leads).
Black Skin : WhiteFur?
Scientist's used to think the bear's hollow hairs acted like fiber optic tubes that would then conduct light to their black skin.
1/5 inch strand of hair conducted less than one thousandth of a percent of ultraviolet light. Meaning the bear's skin recieves very little light.
When female polar bear's are pregnant, they den in the fall after feeding heavily in August and September.
Denning is when the female digs a tunnel into the snow and digs two snow chambers.
Once she has settled into the den she gives birth to one, two or three cubs, twins are common.
After the cubs are strong enough to make the trek to the sea ice (March or April) they leave their den.
These Polar Bears have strong legs with very big, flat feet and not a lot of webbing but some.
Obviously this helps with their swimming abilities but it also helps them so they can search out birds eggs and some other food sources if they are really desperate.
"How do the bears survive in their harsh conditions?"
These bears are very unique creatures; under the bear's black skin which is unusual considering they look white, they can have up to 4.5 inches of fat to keep them warm.
With this fat, when they are in the water they rely on their fat to keep them warm, because the wet fur is a poor insulater.
On land, the polar bear's thick coat keeps them warm.
Even though they are white, they started to evolve from about 5,000,000 years ago from brown bears.
Polar Bears have to be strong swimmers in order to catch these seals in the water.
They can swim for several hours at a time.
Ariel Hurley, 3A, Stokes