What's the use of small fish, cows and swallow tails?

In order to adapt to life in water, most fish's tails are a bit like fans. When swinging hard, it pushes the body forward like a propeller. At the same time, the fish's tail can control the direction and act as a rudder.

2. Cattle

The cow's tail can swing from side to side. It can drive away mosquitoes, flies and flies that fall on cattle. There are also horses and mules, which are composed of very long coarse hairs and can also swing from side to side to drive away mosquitoes and flies that fall on mules and horses.

3.swallow

A swallow is a kind of bird. The tails of many birds, such as swallows, sparrows, crows, etc., can balance their bodies, adjust their speed, change their direction and control their rise and fall in flight, so they are called "universal rudders".

Extended data

In order to avoid predators, geckos can cut off their tails and regenerate in an emergency. It usually takes them only 30 days to regenerate their tails, which is faster than any other kind of lizard. Their regenerated tails have spinal cord and are fully functional. This discovery may improve the treatment of human spinal cord injury.

Through laboratory research, the researchers found that there is a special kind of cells called radial glial cells in the stem cells of gecko spinal cord. In the development of nervous system, they also act as scaffolds for the migration of newborn neurons. Usually, they are relatively inactive, and if their tails are cut off, they start to act. Learning from gecko through research can guide the self-repair of human spinal cord injury.

Baidu Encyclopedia-Tail (tail of animal body)

People's health network-another trick for gecko to teach spinal cord regeneration