Why does the instantaneous membrane in the eye close the moment before the woodpecker hits the trunk

Protect your eyes.

A common name for birds of the family Woodpeckers of the order Ornithischia. It is a common resident bird, and the most widely distributed species in China are green woodpecker and spotted woodpecker. The woodpecker is a well-known forest bird, and in addition to eliminating pests under the bark such as the larvae of longhorn beetles, its traces of chiseled wood can be used as an indicator of hygienic harvesting in forests.

They feed on pests such as beetles, gidding insects, moths, and bugs, and can eat about 1,500 of them every day. Due to the large amount of food and wide range of activities of woodpeckers, if a pair of woodpeckers inhabit a hectare of forest, they can peck more than 90% of the gidding insects in one winter.

A common name for birds of the family Woodpeckers of the order Ornithischia. The mouth is as straight as a chisel; tongue long and retractable, apex lined with short hooks; Unlike other birds, which stand on branches, it climbs on upright trunks. Its feet are slightly shorter, with 4 toes, 2 toes forward and 2 toes backward; The tail is flat-tailed or wedge-shaped, with mostly 12 tail feathers, and its tail is wedge-shaped, and the feather shaft is hard and elastic, supporting the body when pecking wood.

In this way, the woodpecker can firmly grasp the trunk of the tree so that it does not slide down, and can also jump on the trunk, move quickly along the trunk, jump upwards, backwards downwards, or crawl in circles to the sides.

Different species of woodpeckers vary greatly in size, ranging from a dozen centimeters to more than forty centimeters. For example, the velvet woodpecker is about 15 centimeters long, and the North American black woodpecker is about 47 centimeters long. The acorn woodpecker is about 20 centimeters long.

The red-headed woodpecker is similar in body length to the acorn woodpecker, about 19 23 cm. When spring arrives, male woodpeckers make loud calls that are stretching their territory and warning others not to invade. These cries are often particularly loud because of the resonance of the tree holes.

In other seasons, woodpeckers are particularly quiet. However, when the male woodpecker is courting, he will use his hard beak to beat rhythmically on the hollow trunk of the tree, making a crisp "tuk-tuk" sound, so as to woo the female.

The reason for closing the instantaneous membrane of the eye is to prevent the debris of the tree trunk from injuring the eye.

Because when knocking on the trunk of the tree. There will be some powder from the trunk flying out. The eyes are closed to protect the eyes.

The instantaneous membrane of the woodpecker's eyes closes quickly, both to prevent the impact of the splashed sawdust from hurting the eyes, and to wrap the eyes like a harness so that the eyes do not pop out.

To protect your eyes from sawdust.

Because there are sawdust flying out, this can protect your eyes.

It is to prevent the sawdust from flying out and floating to the eyes.

Because sawdust will fly out, in order to protect the eyes.

Because I am afraid that the tiny particles inside will get into my eyes.

To protect your eyes, there will definitely be debris splashing if you peck at the trunk.

React instantaneously, afraid that small things will get into your eyes.

Woodpeckers must keep their eyes closed when pecking wood to protect their eyes from popping out of the impact of the impact.

The woodpecker's eyes have a very ingenious organizational structure in terms of shock absorption, and there is a mucopolysaccharide substance in its eyes, which can play a role in cushioning and protection.

The moment it pecks at a tree, the instantaneous membrane of the woodpecker's eye also closes quickly, preventing the splash of sawdust from splashing into the eye, and at the same time wrapping the eyeball to prevent it from popping out due to the impact.

No Observation of the structure of the woodpecker's head shows that there is an extremely narrow gap and a small amount of fluid between the woodpecker's skull and brain, making it much more difficult for shock waves to propagate through the woodpecker's head than in a human's head. The woodpecker's brain is tightly encased by a dense and elastic skull, which is spongy and forms a protective cushion with excellent shock absorption function, which can effectively cushion the impact of external forces. In addition, the muscles in the woodpecker's head help absorb and disperse the force of impact.

The pedicle tissue at the base of the tongue extends around the brain and also protects the brain. According to the observation, it was also found that the straight tapping method of the woodpecker is conducive to avoiding twisting forces and preventing brain nerve injury and brain **.

I'm also curious about this question today, I'll talk about it, read some information, woodpeckers peck wood about 10,000 times a day, the fastest can reach 20 times per second, the maximum speed can reach 7m s, which is equivalent to a speed of 25 kilometers per hour at the moment of hitting the tree to stop, think about what it feels like if it is a person who lets the car hit it like this, not to mention the first moment it hits the tree, if the woodpecker does not close its eyes, the eyeballs may have a tendency to fly out, it may want to use the eyelids to support it. There is also a possibility that even if you are not afraid of the eyeballs flying out, a lot of sawdust and dust will fly out the moment the awl hits the tree, and it is a bit confusing to keep your eyes closed. To sum up, the woodpecker decided that it was better to decorate early in the morning or close his eyes.

The information is all seen on the Internet, and there may be some discrepancies in the data.