INTERNATIONAL POLAR BEAR DAY February 27th!

It’s International #PolarBearDay!
A few facts about Polar Bears...
All moms work hard, but polar bears are undoubtedly some of the hardest working single moms. Here are five of my favorite facts about polar bear families:
1. Polar bear moms have one of the longest fasting periods in the animal kingdom. After feeding all winter, polar bears in seasonal ice areas like Hudson Bay come ashore in the summer.
Females who mated in the spring and are fat enough to sustain a pregnancy build and enter a maternity den in the fall, which is soon hidden under drifts of snow. While in the den, the mother bears don’t eat or drink. Instead, they live off their body fat.
In the late fall or early winter, they give birth to one to three tiny and helpless cubs, nursing them until they are strong enough to leave the den three to four months later. The denning period is considered the most vulnerable time in a polar bear’s life.
Once the cubs are strong enough to withstand the rigors of the Arctic outside the den, the family will head to the sea ice to hunt seals right away because mama is hungry: by now she’s gone eight months without a meal!
2. Polar bear cubs grow incredibly rapidly for the first few years of life.
Newborn cubs are only ~0.6 kg (1.3 lbs.) when born. By 3 months old, they may weigh ~10-12 kg (22-26 lbs.), growing approximately 20 times their original body weight in 12 weeks. If newborn humans did this, we’d need adult-size bassinets.
Cubs continue growing rapidly, more than doubling their weight between den emergence and their first birthday, and yet again between their first and second birthdays.
By 2 years old, male cubs can be as big as their moms and weigh hundreds of pounds.
The mother bear’s rich milk is a significant contributor to the rapid growth of cubs but comes at a significant cost to mom.
3. Polar bear milk is the fattest of any land mammal's.
Polar bear milk is about 31% fat when cubs are born, providing enough calories to help cubs grow rapidly.
The mother’s milk changes fat content and composition as cubs get older and nurse less, becoming closer to 18% fat by the time the cubs are a year old.
Although polar bear moms may nurse cubs through their second birthday, some females wean their cubs sometime after their first birthday. It may depend on the body condition of the mother-nursing cubs is extremely costly from an energy standpoint. Either way, mom helps make sure her cubs get enough to eat!
4. Cubs have to learn all about being a polar bear in just over two years.
Cubs stay with their moms for just over two years, learning as much as possible including how to navigate sea ice, when and where to migrate, how to hunt seals, how to avoid danger, and how to use their innate curiosity to learn new things.
Young cubs listen very well to their mothers, sometimes even mimicking mom’s movements exactly. As the cubs get older, some listen better than others.
Moms must make decisions in the best interest of the family, balancing the best places to hunt seals with keeping cubs safe from dangers like adult males or drowning in frigid waters.
When cubs are weaned, they are considered subadults (from 2.3 years to 5 years old) and have to put their newly acquired skills to the test.
5. Female polar bears start a new family about every three years.
From about the age of 5, female polar bears mate and produce cubs approximately every three years depending on multiple factors.
If female bears reproduce consistently until their late 20s, that’s more than eight litters of cubs at one to three cubs each. One female polar bear could potentially produce over a dozen cubs in her lifetime, though not all cubs will make it into adulthood or reproduce themselves.
As soon as moms wean their cubs, their days of being solitary are short lived. Very soon it’s mating season (after which the males leave and are never seen again).
After mating, females must binge on seals to store as much fat as possible in order to start the cycle all over again.
International Polar Bear Day is today - February 27th - let's all celebrate even more amazing things about polar bear families!
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