During pregnancy, a female bear has to hunt for food because she needs to double her weight

Polar bears do not hibernate; only pregnant females lie in the den

A female polar bear does not give birth to more than five cubs in the course of her life

A female bear’s pregnancy lasts 230–240 days, after which she gives birth to tiny bear cubs weighing 400–750 g

Polar bears are considered among the most caring and dedicated mothers in the animal kingdom

Newborn bear cubs need round-the-clock care

A mother takes care of her cubs for two years until they reach maturity