Do lions, pandas and brown bears hibernate in the zoo's town garden treasure?

Mighty lions, lovely pandas and clumsy brown bears can often be seen in zoos. So do the animals of these three town park treasures hibernate? According to the staff of Changsha Zoo, lions absolutely do not hibernate. Because it's a mammal! The body temperature of mammals is constant! It will not be affected according to the change of external environment temperature, so there is no need to hibernate! And lions live in the savanna, and the winter temperature will not be lower than 15 degrees. It's not cold enough to hibernate. Pandas don't hibernate. The giant panda is not afraid of the cold and never hibernates, because it is a warrior from the Quaternary glacier, even if the temperature drops to minus 4 ℃-14 ℃, it still walks through the snow-capped bamboo forest, choosing delicious bamboo, let alone many animals such as black bears, hiding in tree caves or caves for hibernation. It is not afraid of moisture and spends the year in a damp forest with a humidity of more than 80%. Brown bears have the habit of hibernating from late October or early November to March-April of the following year. In order to accumulate about 50 kilograms of fat needed for hibernation, 400-600 kilograms of berries and other foods must be eaten in autumn. As winter approaches, we begin to prepare caves, choose sunny areas covered with fallen trees and withered branches and weak cold winds, live in big tree caves or rock crevices, and sometimes dig holes in dry mounds on the swamp ground. Bedding with withered grass, leaves, or moss in a cave with front claws. Generally speaking, each individual lives in a cave alone, and only the female and the cubs under the age of 3 live together. Before entering the cave, turn around the mouth of the cave for a while, then jump into the hole, or fall back into the nest, or mess up your own footprints, so as not to be discovered by natural enemies and better hide yourself. During hibernation, life is maintained mainly by the fat stored in the body, and if there is danger, you will wake up at any time. In warmer days, sometimes I move outside the cave for a while.

PS: why do animals hibernate?

Hibernation, also known as "winter sting". The life activities of some animals are extremely reduced in winter, which is a kind of adaptation to the adverse environmental conditions (such as lack of food and cold) in winter. Bats, hedgehogs and polar squirrels all have the habit of hibernating. Hibernation is that the body temperature of some abnormal temperature animals (some hibernating mammals and birds) and variable temperature animals can be reduced to close to the ambient temperature (almost to 0 ℃) in the cold winter, and the whole body is paralyzed. Under the further decrease or rise of the ambient temperature, or other stimulation, the body temperature can quickly return to the normal level.

Hibernation is a magic weapon for warm animals to avoid food scarcity in the cold winter. As soon as winter comes, the hedgehog shrinks into the mud hole, curls up and does not eat. It hardly breathes and its heart beats surprisingly slowly, beating only 10 times and 20 times per minute. If you immerse it in water, you won't die for half an hour, but when an awake hedgehog is immersed in water for 2 or 3 minutes, it will drown. Why?

During hibernation, the animal's nerves have entered a state of paralysis. Some people have experimented with bees: when the temperature is 7: 9 ℃, the bee's wings and feet stop moving, but when it is gently touched, its wings and feet still wobble slightly; when the temperature drops to 4: 6 ℃, it does not respond at all, apparently it has entered a deep state of paralysis; when the temperature drops to 0.5 ℃, it goes into a deeper sleep. Thus it can be seen that the depth of nerve paralysis during hibernation is closely related to temperature.

In addition, the body temperature of the animal decreased significantly during hibernation. According to the study, ground squirrels released a total of 70 calories during 130 days and nights of hibernation, but 579 calories in 13.7 days and nights after hibernation. Generally speaking, an animal can only release 0.5 calories per day and night during hibernation, but when it wakes up and is excited, it can release 42 calories per day and night. Thus it can be seen that when the hibernating animal's body temperature drops, the metabolism in the body becomes very slow, so it can only maintain its life.