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Because of the bears' body heat and snow insulation, the den stays warmer than the outside air temperature. Scientists are now using this heat to detect bears with forward-looking infrared technology (FLIR).

Polar bear cubs learn to hunt by watching their mother. Cubs try hunting in their first year, but don't seem to be successful until they're over one year old. Even then, they only spend about 4% of their time hunting. By the time they're two years old they spend about 7% of their time hunting and can catch a seal every five or six days. Polar bear cubs are vulnerable for the first few months of their lives. They are easy prey for predators like arctic foxes. Staying in their dens keeps them warm, and protects them from predators. When they leave they will be about 15lbs and more difficult prey for other arctic hunters. 10. Sunbear cubs are early foragers Most dens consist of a single chamber slightly elevated from a short entrance tunnel, but they can be complex with several chambers. On average, the chamber is 2 m (6.6 ft.) long, 1.5 m (4.9 ft.) wide, and 1 m (3.3 ft.) high, not much bigger than the bear. Polar bears maintain a ventilation hole through the chamber ceiling to provide fresh air.By the time the mother and cubs emerge from the den in late March or April, the cubs weigh 10 to 15 kg (22-33 lb.). Grizzly bears cubs start eating solid foods at a few months old, but they will continue nursing for as long as 3 years. The mother bear will decide when she wants her cubs to stop nursing. This is usually when she is ready to mate again. image: Pixabay.com 6. Bears use trees as babysitters for their cubs For the next three or four months the cubs nurse as often as six times a day. The length and number of nursing bouts gradually decreases as the cubs grow older.

At birth, polar bear cubs weigh about 454 to 680 g (16-24 oz.) and are about 30 cm (12 in.) long. Males are born slightly larger than females. Mother polar bears are extremely protective of their young, even risking their own lives in their cubs' defense. The average fat content of polar bear milk is 33%, similar to the milkfat of other marine mammals. For comparison, human milk has a 3-5% fat content. Once mated, females begin depositing fat in preparation for cubbing. Females need to gain at least 200 kg (441 lb.) for a successful pregnancy. Mother polar bears nurse their cubs for as long as 30 months. Some cubs stop nursing as young as 18 months of age, but remain with their mothers for survival until they are 30 months old.

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Most dens are on land, within 16 km (10 mi.) of the coast. In some areas, dens are more than 100 km (62 mi.) from the coast. A few polar bears make dens on the sea ice. Cubs who are born during hibernation spend the most vulnerable part of their life in the safety of their mother’s den. When they finally emerge in spring, the cubs weigh around 6lbs and many can already climb a tree. image: Pixabay.com 9. Polar bear cubs stay in their den for around 60 days Bears have anywhere from 1-5 cubs at a time, with 2 being the most common number. Most bears are capable of raising 2 cubs, with the exception of the Giant Panda. The Giant panda will often discard the weaker cub in favor of the stronger one, this is more common when the mother has a decreased milk supply or is a first-time mom. image: Pixabay.com 2. Bears have delayed implantation Cubs begin eating solid food as soon as their mother makes her first kill on the sea ice (about three to four months of age).