Normally, a female Polar Bear, or "sow", will give birth to twins in the winter. She can give birth to as few as one or as many as four. But the average is twins or a pair. The cubs are born, sometime between late November and January, in a den the mother has already built by digging deep into a snow drift. This helps to protect, and insulate, both the cubs and the mother. If a snow drift isn't available she will prepare a den in the soil. Females are very aggressive about protecting their young, and they while raising the cubs on her own. In fact, males have been know to kill the offspring. For more details see sites listed below.
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Polygamous. Mating occurs in the spring, with implantation of the embryo following in late fall. Females typically have two cubs, although a litter may range from one to three, rarely four. Births occur in early winter. The cubs stay with their mother for at least two-and-a-half years, at which point she may breed again. Sexual maturity is attained at 3-6 years of age.
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