Fact: It is never wise to get between a mother polar bear and her cubs! Though her maternal instincts are quite strong, she does not pay attention to the rivalry of her cubs when they fight amongst themselves for her milk.
Source: National Geographic, December 2000, Bear Beginnings, New Life on the Ice, by Norbert Rosing, page 33.
Fact: In the winter, female polar bears give birth hidden away in their dens. Litters are generally comprised of two cubs, although three are sometimes possible. Polar bear cubs are very cute, but they grow up to be powerful predators.
Source: U.S. Fish and Wildlife Service, Species Profile of the Polar Bear.
Fact: Since male polar bears have nothing to do with cubs, the females keep their young away from the adult males. This is for the cub's own protection, as the males could be dangerous to her youngsters.
Source: National Geographic, December 2000, Bear Beginnings, New Life on the Ice, by Norbert Rosing, page 36.