1948, Dr. EdmundJaeger first described the phenomenon of weak nighthawk hibernating. When winter comes, the weak nighthawk will find a hole in a rock crack or rotten wood to hide and hibernate. During hibernation, their energy consumption is only 7% of the normal state, and they are in a deep dormancy state for weeks or months. Once the hibernation is over, it takes them seven hours to recover their normal activity.
2. Polar Bear: The vast Arctic, a world of ice and snow, is home to the polar bear, the world's largest land carnivore. Polar bears mainly prey on seals. Their sense of smell is very developed, and they can detect seals as far away as 1.6 km, and they also have good eyesight and are good at looking into the distant future.
The polar bear is also an excellent swimmer, who can swim at the speed of 10 km/h for several days. It is recorded that a polar bear swam in the cold Bering Sea for nine days, swam 700 kilometers to the ice far from the land, and then swam 1800 kilometers. When walking on the icy ground, the average speed of polar bears is about 5.6 km/h, but their sprint speed can reach 40 km/h.
In order to cope with the harsh climatic conditions in the Arctic, polar bears will hibernate in the area before winter comes. Compared with other hibernating animals, polar bears have a smaller decline in body temperature and respiratory frequency during hibernation, and they can wake up at any time. Besides, polar bears don't eat or drink for a long time when they hibernate, not all winter. Even more amazing is that pregnant polar bear females can still give birth and breastfeed as usual during hibernation, and can go out with their cubs after waking up in spring, and there is no delay in giving birth during hibernation.