What can a bird fly? Which birds can fly

Birds fly because they have to forage for food or hide from predators.

Dogs bark because they want to please their owners.

Birds can fly because they have wings.

Dogs bark because they have mouths.

Because that's how they've evolved.

Birds have wings so they can fly.

The wings of birds are the first condition for them to have flying skills. Under the same conditions of having wings, some birds can fly very high, very quickly, very far; Some birds can only hover, glide, or even fly at all. It can be seen that just wings have a lot of knowledge.

The structure of a bird's wings is no less complex than the bird itself. If the feathers of the bird's wings are constructed, the principle of aerodynamics can be skillfully applied, and when they are fanning up and down or pressing 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. There are great differences in the wings of various species of birds, so that the difference in wings alone creates many excellent and average "pilots".

Some of the country's second-class protected animals have males weighing more than 14 kilograms, with a body length of 120 centimeters and a wingspan length of 240 centimeters.

For another example, the ** bird with a wingspan of meters, which usually flies at sea 160 kilometers off the coast, is a first-class protected animal in China.

After reading the previous content, some people may ask, can you fly just by wings? No, it's the special bones that send birds to the skies. Bird bones are excellent "lightweight materials", hollow and lightweight.

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.

These favorable conditions undoubtedly give the birds the ability to fly, allowing them to perform their skills in another living space. However, I think there may be other reasons why birds can fly into the blue sky, but humans have not discovered it until now.

From the understanding of the abilities of birds, we can see that exploring the abilities of birds will help humanity to open up new territories.

Basically, all the birds that are noisy will destroy the wheel and fly, and only a few varieties of the letter will not fly.

Elephant ostriches can't fly anymore.

More than 90% of birds are able to fly.

Birds can fly because their wings and chest have well-developed muscles, and the thoracic muscles can pull the wing bones to make powerful movements, thus generating the power to fly.

Birds flap their wings to not only lift their bodies into the air, but also to move them forward and land smoothly.

The internal organs of birds also provide favorable conditions for flight. Birds do not have a rectum to store droppings, nor do they have a bladder to store urine. In this way, when they are flying, they can excrete their feces anytime and anywhere, thus reducing their weight and facilitating their flight.

Habits

Birds eat a variety of foods, including nectar, seeds, insects, fish, carrion, or other birds. Most birds are active during the day, but some birds (such as owls) are active at night or at dusk. Many birds make long migrations in search of the best habitat (e.g. Arctic terns), while others spend most of their time at sea (e.g. albatrosses).

Most birds can fly, and a few flat-chested birds can't, especially those that live on islands, have basically lost the ability to fly. Flightless birds include penguins, ostriches, kiwis (a wingless bird native to New Zealand), and the extinct dodo. When humans or other mammals invade their habitats, these flightless birds are more vulnerable to extinction, such as:

Big puffins, moa in New Zealand, etc.

Every spring and autumn, birds fly in flocks and in the sky, and this seasonal phenomenon of changing habitats in different seasons, either from nesting to wintering grounds, or from wintering grounds back to nesting sites, is called bird migration. Every year, when the earth is rejuvenated, birds begin to carry out a series of activities such as courtship, reproduction, nesting, incubating eggs and brooding.

Because birds have wings. People don't.

The reason why birds can fly is inseparable from their physiological structure, they have a pair of wings full of feathers, when wings, the outer feathers cover the inner edge of the adjacent feathers, so that each feather has a slight rotation ability, and the two wings are constantly flapping up and down, which will cause a huge downward resistance, so as to fly forward quickly.