The cave keeps her warm and protects her from the freezing Arctic winds.
Because they are pregnant during their winter sleep, and give birth during this time of torpor.
A nap. Majority of polar bears do not sleep during the winter. Heavily pregnant sows will, but only for a few months out of the entire winter, then they're up and about with their cubs hunting on the sea ice.
just like human do .
A male and female adult polar bear.
Yes, the female Polar Bear or "sow" does dig. She will dig to build a den, in big deep snow drifts. The den is usually about the size of a telephone booth, with several small alcoves, where the female may give birth to cubs, if she is pregnant, during the long winter sleep. Females are not the only Polar Bears to take a "winter sleep" or to dig a den. When the temperatures drop and stay constantly low, indicating winter has arrived, all Polar Bears, will make a den, to take a long "winter sleep" in, not to hibernate in. Inside the den, it is about 40 degrees on average, warmer than outside. They are insulated and protected from the extreme temperatures and weather outside. For more details see sites listed below.
A female bear is called a sow.
it is winter
Males are much larger.
female
they hunt for all there food during the winter
a male polar bear and a female polar bear mate and after 9 to 10 weeks of pregnancy the female gives birth to a cub. The birth is very graphic.
only female polar bear hibernate, they hibernate about Nov-Oct month.