Summer sleep, like hibernation, is a natural phenomenon for animals to survive in the season of food shortage. Xia Mian is also called "Xia Zhe". In summer, the life activities of animals are extremely reduced, which is an adaptation of some animals to the hot and dry season. For example, ground tigers (insects), African lungfish, sand lizards, grassland turtles and ground squirrels all have the habit of sleeping in summer. There is a summer sleeping dog who is very afraid of heat.
In the dog days, it will find a cool summer resort and sleep for about 20 days.
In Madagascar, Africa, there is a porcupine that feeds on earthworms.
Because of the hot summer, earthworms can't survive in the shallow layer, and porcupines have no food, so they have to go into a long summer sleep.