Bats evolved from flightless mammals. About 100 million years ago, bats lived in trees all year round. Like lemurs or squirrels, they could jump on branches. Later, this species changed. Some of them were born with more skin extensions between their arms and bodies, and could jump higher in the air, Bats that produce this mutation are more mobile than other bats and therefore easier to survive and reproduce. In this way, in the process of natural selection, the skin diaphragm between the arms and the body of bats became wider and wider, and finally evolved complete wings.
1. Some bats can fly more than 50 kilometers per hour.
2. Some bats can fish. The Mexican rabbit lipped bat can catch more than 30 small fish in one night.
3. The wingspan of a small bat with a pig nose is only 14cm, and the wingspan of a fox bat as big as a dog is 2m wide.
4. Bats can capture and distinguish 250 groups of echoes in one second. (Note: One round trip of sound wave counts as one group.)
5. Since autumn, bats have accumulated a layer of fat in their lower abdomen, and their weight before hibernation has become more than 1.5 times that in summer.