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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. Some females may seek out maternity dens as early as late August, but most enter dens in mid to late October. Dens protect newborn cubs from winter's temperature extremes. During their first few weeks of life, polar bear cubs nurse most of the time and stay close to their mother to keep warm. 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

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. 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. 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. 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

The most frequent litter size is two, followed by litters of one. Litters of three are less common than twins or singles, and litters of four are rare. Polar bear cubs are born November through January in a den. Mother and cubs emerge from their den in late March or April. 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 Most adult females give birth once every three years. In populations with access to abundant food, birth occurs once every two years.

Females usually dig dens in snowdrifts on southerly facing slopes. Some dig earthen dens that later become covered by snow. 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.).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