Why do bats hang upside down to rest

The way bats rest is quite strange in the animal world. Other animals are sleeping, but they sleep upside down with their heads down. What are the benefits of this "hanging sleep"?

It turns out that bats have short hind legs and can't support walking. They can only crawl on their forelimbs. If they crawl, they will be slow and clumsy. What's worse, their hind legs can't bounce and support them to take off as quickly as birds. Therefore, bats cannot fly on the flat ground. They must climb to a high place and glide for a distance before taking off. Such reaction speed is obviously not conducive to protecting yourself. If bats make nests on the ground and lie down and rest like other mammals, things will be very bad. Because once the predator arrives, he can't run fast and fly. He can only wait to be eaten.

But hanging it from a high place is a good choice. First, it has a wide view. Second, once there is a wind and grass, it can take off quickly. In addition, the skin of bats is very sensitive. It will be very uncomfortable to rub against things. Hanging upside down is different. In addition to holding things with toes, there is air all around, and there is no need to worry about hard objects scratching precious wings.