Why birds can fly and why birds can fly

Quite simply, because birds have wings.

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Summary. Bird (scientific name: bird), a bird of the phylum Chordates of the kingdom Animalia. There are many varieties of them and they are found all over the world.

The body of the bird is streamlined (spindle or fusiform), the body surface is covered with feathers, and the forelimbs generally become wings (some species have vestigial wings). The rectum is short and has a well-developed digestive system, which helps to lose weight and facilitates flying. The heart has two atria and two ventricles, and the number of beats is rapid.

In addition to the lungs, the respiratory organs also have multiple air sacs to assist breathing, so that the bird has oxygen through the lungs during both inhalation and exhalation, that is, double breathing.

Why can birds fly.

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<> hello Bird loss can fly is and spike because: the outside of the bird's body is light and warm feathers. Feathers not only have a thermal insulation effect, but also make birds streamlined and can fly.

The bones of birds are thin and light, and the bones are hollow.

Bird (name of Potato Scale: bird), a bird of the phylum Chordates of the animal kingdom. There are many varieties of them and they are found all over the world.

The body of the bird is simple and linear (spindle or fusiform), the body surface is covered with feathers, and the forelimbs generally become wings (some species have vestigial wings). The rectum is short, the digestive system is well developed, and there are barriers to help lose weight and facilitate flying. The heart has two atria and two ventricles, and the number of beats is rapid.

In addition to the lungs, the respiratory organs also have multiple air sacs to assist breathing, so that the bird has oxygen through the lungs during both inhalation and exhalation, that is, double breathing.

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Problem description: Why do birds fly when they have wings? Is it due to the rising force caused by the vibration of the air? If not, what is the reason? Can air vibrations make objects fly? Please break it down in detail. Thank you!

Analysis: The lift force during take-off** is the reaction force of the bird's wings to the bird's wings and the dynamic air on the bird's wings. When gliding in the air, the structure of the wings generates lift, which is the Panuri principle in fluid mechanics, the air above the wings flows fast relative to the wings, and the flow speed below is slow, so that the air above can lift the wings upward.

In addition, eagles are adept at using updrafts to make themselves soar through the air.

The wings of birds are the first condition for them to have flying skills.

The feather structure of the bird's wings can skillfully use the principle of aerodynamics, when they fan up and down or lift up and down, they can push the air and fly forward using the principle of reaction; The structure of the feathers is reasonable, which can effectively reduce the air resistance encountered during flight, and some can also play a role in de-trembling and noise reduction. The bird's streamlined shape has the least resistance when moving in the air, which is conducive to bending and flying.

What sends birds to the skies is their special bones. Bird bones are excellent "lightweight materials", hollow and lightweight. The bones of birds are thin and light, the long bones are filled with air, all the bone fragments of the skull are completely healed, the thoracic and lumbar vertebrae, the buried vertebrae and the caudal vertebrae are healed together, and the vertebrae and the left and right girdles are also healed together.

According to the analysis, the bird bone accounts for only 5 6 of the bird's body weight; Human bones account for 18 of body weight. Due to the light bones, the wings are very easy to drive, and there are many air sacs connected to the lungs in the bird's body, which is very beneficial for weight loss and buoyancy.

The bird's heart is completely divided into two appendages and two ventricles, which not only gives the whole body fresh blood rich in oxygen, but also keeps their body temperature constant, which is conducive to flight.

Birds do not have bladders and have short rectums, so they do not store feces and urine in their bodies, and the urine produced is excreted at any time along with the feces. This is also the result of losing weight and being fit to fly.

From the characteristics of the bird's body structure, it can be seen that birds not only have well-developed wings, but also serve as flight organs. At the same time, the structure of the bones, digestion, excretion, reproduction and other organ functions in the body is conducive to weight loss and enhance the ability to fly. As a result, birds can overcome gravity and spread their wings.

Because the bird has light and warm feathers, the feathers not only have a thermal insulation effect, but also give the bird a streamlined appearance, with the least resistance when moving in the air and have a keel process of at least one meter, which is filled with air, making the weight very light. The same principle is true for airplanes.