Why do bats suddenly appear in the sky?

As the only mammal on earth that can really fly into the sky, bats have lived on the earth for 52 million years. There are more than 1400 species of bats, accounting for 20% of mammals, ranking second and distributed all over the world. Bats are nocturnal animals. They sleep during the day and come out at night. Especially in summer nights, they are very active. They come out for food at night and go back to sleep the next morning. They will live under the eaves and crevices of human houses, and some will live in various caves. In winter, bats hibernate in some places and migrate to the south for the winter. Although the light is poor at night, bats can fly safely and catch insects as food, thanks to their built-in sonar positioning system. Bats generally emit ultrasonic waves with a frequency higher than 20 kHz, and these sound waves will be reflected by prey or objects. After receiving them, they can know the position of the reflector accurately. Bats have extremely developed hearing, and they can distinguish weak echoes from background noise. Why do bats fly in groups? Bats usually move in groups, sometimes tens of thousands or even hundreds of thousands of bats gather together, and they have complex social life habits. There are many possible reasons why bats first appeared in large numbers. Bats have many natural enemies, including owls and other raptors and various snakes. They appear in groups, probably to confuse predators waiting to ambush them. The bigger the bat colony, the earlier it comes out, and the more it is, the safer it is. Bats fly in groups. They communicate with each other and transmit information about their prey. If a bat finds a feeding area the night before, for example, there are swarms of flying insects in a place, it may gather a large number of similar people to hunt together. In addition, summer is also the breeding season for bats, especially in late summer. At this time, bats living in different habitats will gather together to participate in the annual breeding festival, and males will attract the attention of females in various ways. Are there any signs of bats appearing in large numbers? As mentioned above, the appearance of a large number of bats does not mean that anything bad will happen, it is probably just a natural phenomenon. From June, 2065438 to June, 2009, Yibin, Sichuan Province also reported that swarms of bats (initially thought to be swallows) appeared in the sky. Earthquake experts responded that bats are very active at this time of year, so we should not blindly associate this phenomenon with disasters. In addition, if human activities destroy the bat's habitat, it will also cause a large number of bats to bump around. At the turn of 20 19 and 2020, the worst mountain fire occurred in Australia, and a large number of forests were burned. Scientists estimate that as many as 3 billion animals were killed in the mountain fire, including the giant bat-flying fox, whose wingspan can exceed 90 cm and the longest can reach 1.5 meters. Many bats have escaped. They have nowhere to go but to fly to the towns where people live. It is estimated that as many as 600,000 bats flooded into the city and flew in the dark. A helicopter that came to rescue people was trapped by bats and could not land at its destination. Many people are worried about contacting bats, so they have to close the doors and windows and hide at home. In addition to the direct invasion of bat habitat by human beings, in recent years, global warming has triggered climate change, making it more prone to extreme weather, which will also make many animals, including bats, face enormous survival challenges. In order to reduce the contact between humans and bats and avoid unknown injuries, we humans should do a lot.