What is the only mammal that can really fly?

Bats are the only mammals that can really fly. When flying, they send out ultrasonic waves from their mouths and receive positioning with their ears. Night activities, some have the phenomenon of hibernating in situ.

At dusk or dark night, bats can identify and catch small insects at high speed at night with their special skills-echolocation. Insects such as flies and fruit flies fly very fast and are extremely difficult to catch, while bats can easily catch them by echolocation. High-speed film photography shows that bats can catch two flies in half a second, while laboratory observation shows that a bat can easily catch more than 250 flies in ten minutes. Such a quick capture skill is done in the dark, just like many animals in the light. Studies have shown that bats have not changed much in the process of evolution, which shows that they have strong adaptability to darkness and predation. Few birds and animals prey on insects at night, but there are also a few insects that are active at night. In reality, bats gather in many places and there are few pests and diseases.

Bat's judgment on the direction is also wonderful. Although similar to humans and other mammals, it is much more sensitive and accurate. It compares the sounds entering two ears and analyzes them at the speed of thousands of seconds in the auditory nerve center of the brain. If you plug a bat's ear, you can only avoid one big obstacle. If you plug it for a long time, or cause permanent damage to its ears, it will starve to death because it can't catch bugs. If the bat's mouth is forcibly closed, the same situation will occur, which shows that its sound wave transmitting system is in its mouth, while its receiving system is completed by its ears. When gagged, its echo system will be destroyed, so bats with sore throats will not only starve to death, but also hit obstacles and die.

Scientists have done an experiment: in a big room without a ray of light, there are many ropes hanging around, and bells are hung on the ropes, and then some bats and some fast-flying insects are released. The result of the experiment is that insects are preyed and no bell rings. Moreover, when the bat's eyes are completely covered, its predation ability is not affected at all. So how do bats catch insects so quickly and accurately?

Studies show that bats only send out 10 pulses per second when cruising. Once they receive the echo, it means that there is food or objects around them. When insects and other food get closer and closer to bats, the speed of echo pulses will increase, sometimes reaching 200 times per second. Accelerating speed means that insects are approaching, and the number of pulses transmitted per second will not be confused with the frequency of sound, not to mention the frequency of tone is variable. For example, when a bat swims, it sends out a slow pulse with the speed of 10 times/second, and the frequency can be adjusted to 100000 cycles/second. When insects are detected, this frequency will drop to 40000 cycles/second. When the target approaches, it becomes about 30,000 cycles per second to 20,000 cycles per second. This phenomenon shows that the bat is using a method to make sure that the echo it hears is from itself, not from other sounds or bats. This is achieved by controlling the frequency and pulse efficiency of its own system.

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