Do all bears hibernate in winter?

Not all bears do not hibernate. When they have enough food for the winter (such as being kept in captivity), none of the eight existing bears hibernate. In the wild, the hibernating patterns of bears are summarized as follows.

Non-hibernating animals: giant panda, lazy bear, sun bear and Andean bear.

These bears live in areas where there is no serious seasonal food shortage. When the weather turns cold and the food supply decreases, pandas and Andean bears will migrate to lower heights. Sun bears and lazy bears live in warmer regions of Asia, and their food supply will not be significantly reduced due to seasonal changes.

Moderate hibernating animals: polar bears and Asian black bears.

Male polar bears and pregnant female polar bears do not hibernate at all. This is because the high feed season is the opposite for them. In winter, when the food supply of brown bear ancestors is scarce, polar bears will have more sea ice to prey on seals. However, when they have to rely on sparse food, they do reduce their metabolism in summer.

Like all bears, female polar bears will go to delayed implantation after mating. If they don't gain enough weight to keep pregnant, they won't implant the fertilized egg into the uterus, but absorb it into the body. If they have enough fat to meet their own needs, embryo development and milk production of one or two cubs, then they can build nests from snowdrifts. One to three cubs (usually two) were born in1February and weighed more than one pound. They grow so fast in their mother's fat-rich milk that they weigh 22-33 pounds when they leave the nest within three to four months.

Asian black bears hibernate only in a part of their range. Those who live in the south will skip hibernation. In the north or those places with higher altitude, first migrate to the south or lower places, and then hibernate for the last time, regardless of whether men and women are pregnant or not. The birth of cubs follows the pattern of polar bears, and the nature of hibernation is similar to brown bears and American black bears.

Hardcore hibernating animals: brown bear and American black bear

American black bear, American bear, although the most common color is black, it has a wide range of hues, including various shades of brown, blue-gray (glacier bear), blond hair and white (spiritual bear). In some parts of Florida and warm areas of California, they don't hibernate. However, in other places, they must do so. Birth is similar to the above process for polar bears, and other details are similar to the following process for brown bears.