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Polar bears (Ursus maritimus) give birth in dens that they dig up deep beneath the snow. After birth, the cubs remain in the den for many months and grow as much as 20 times their birth weight.

Female polar bears build their dens in snow drifts on land or sea ice around October or November. They give birth in December or early January when the cubs are blind, hairless and weigh just 0.5 kg.

Drifting snow helps polar bear dens remain hidden. (B.J. Kirschhoffer/Polar Bears International), CC BY An elusive phenomenon While they provide ideal conditions for developing cubs, maternal dens ...

Watch the heartwarming moment three tiny polar bear cubs emerge from their den for very first time - in incredible footage that took 10 YEARS to capture READ MORE: Shocking maps show the world's ...

Newborn polar bears are hairless and weigh just 1 pound (0.5 kilograms). However, they grow quickly thanks to their mother's fatty milk and reach 22 pounds (10 kg) by the time they emerge as cubs.

Pregnant female polar bears usually enter a den in the fall, give birth in mid-winter, and remain in the den nursing their cubs until the family is ready to emerge in the spring.