Living environment: common bats often live with other kinds of bats, rest during the day, and come out of their habitats one after another in the morning and at dusk, and use ultrasonic waves of 25-27 khz to prey on mosquitoes, stone moths, moths and other foods. The hunting height is 20-40 meters. If food is scarce, sometimes they will move all night and prey on harmful insects such as gnats. Usually, females and males live together, but during pregnancy and lactation, 40 to 50 females live in groups, while males live alone or form small groups.

The main natural enemies of common bats are snakes and lizards. Its wintering situation is unknown, but it hibernates. When hibernating, a single one hangs on the top of the cave or falls on the rock wall, mostly distributed in the depths of the cave. The temperature in the cave is 7℃, and the surface temperature is close to the air temperature.

Citrus that feeds on bats is a factory. Some species like nectar and fruit, while others like to eat fish, frogs, insects, animals, blood and even other bats. -Generally speaking, big bats generally feed on fruits or nectar, while small bats mainly prey on insects.

Bats that feed on insects have different degrees of echolocation system, so they are called "live radar". With this system, they can fly and catch food in complete darkness, use echolocation under a lot of interference, and send out ultrasonic signals without affecting normal breathing. There are structures called "nasal lobes" on the nose and mouth of their heads, and there are complex special skin folds around them. This is a strange ultrasonic device. It has the function of emitting ultrasonic waves and can continuously emit high-frequency ultrasonic waves. If they encounter obstacles or flying insects, these ultrasonic waves can be reflected back and then received by their extraordinary big auricles, so that the feedback information can be analyzed in their tiny brains. This kind of ultrasonic detection has extremely high sensitivity and resolution, so that they can not only determine the direction and locate their own flight path according to the echo, but also distinguish different insects or obstacles. In order to avoid or chase effectively, bats can fly freely in the air with accurate echo location and extremely soft skin membrane, and even use clever curves to constantly change the direction of ultrasonic waves to prevent insects from interfering with their information systems and trying to escape.

The sexual cycle of the whole bat population is synchronous, so most mating activities take place within a few weeks. Pregnancy is different. Delayed implantation, similar time difference of 3~ 10 months. Many kinds of female animals will move to a special habitat after pregnancy. Bats breed once a year, each giving birth to 1~2; Babies are born hairless or hairless and often can't see or hear for a period of time; The young grow rapidly, generally reaching the adult body at 6-8 weeks old, and shedding fetal hair at 1-2 months old. Pups are cared for by their parents for 5 weeks to 5 months, depending on different species. The longest life span can reach 33 years, and most species may average 4-5 years.