There are significant differences in hibernation habits between polar bears and penguins.
Polar bear:
Polar bears do hibernate, but their hibernation is different from that of other animals. The hibernation of polar bears is partial hibernation, especially for pregnant female bears who find a place to rest during the harsh winter, gradually reducing their breathing and entering a semi hibernation state. At this point, they can go without eating for a long time to store energy and survive the winter. However, male and non pregnant female bears usually do not hibernate due to the need to continue hunting seals for survival.
Scientists also speculate that polar bears may enter partial summer sleep when the amount of floating ice decreases and foraging becomes more difficult in summer.
Penguins:
Penguins usually do not undergo traditional hibernation. They are warm blooded animals with effective means of keeping warm, such as thick feathers and fat layers, which can maintain body temperature and normal activity in winter.
Sometimes, in extremely cold conditions, penguins may sleep for long periods of time on sea ice to save energy, but this does not equate to hibernation in the traditional sense.
It should be noted that some information mentions that "penguins are hibernating animals", which may be inaccurate. In most biological and ecological literature, penguins are not considered hibernating animals.
Polar bears undergo partial hibernation, especially pregnant female bears during the harsh winter season; Penguins, on the other hand, do not engage in traditional hibernation. These two animals have their own unique strategies and habits in adapting to extreme cold environments.