One day, Xiaobao was playing in the park and suddenly saw a bird falling on a branch. He walked over quietly to look at it carefully, but he was still discovered. The bird started and flew away quickly. Xiaobao looked in doubt and turned his head and asked, "Mom, why do birds fly!"
The body structure of the bird and its own conditions make it fly
This question is simple and simple, and difficult, but I don't know how to answer him. I said, "Let's go back and check the information together! Mom doesn't know much." [Struggle]
It turns out that the bird can fly is not only because it has a pair of developed wings, but also because of its beautiful and fluffy feathers. In addition to keeping heat, the bird's feathers can also reduce the resistance to air during flight and eliminate noise reduction! Moreover, the bird's bones are hollow, and its metabolites will be discharged from the body in time, which makes the bird's weight very light.
In addition, the bird's heart has two atria and two ventricles, which can not only transport blood to its whole body, but also keep its body temperature constant. It is precisely because of these conditions that the bird can fly freely in the air.
In fact, the idea of making aircraft is derived from the flight of birds.
