Buoyancy principle: Archimedes, a famous physicist, once said that buoyancy is not limited to water, but also produces certain buoyancy in the air, which is one of the principles for an airplane to take off and run stably. In fact, Luban birds use this principle.
Luban birds are mainly wooden birds, which are relatively heavy, but if they spread their wings in the air and the surroundings are round, they can achieve strong buoyancy with the help of wind, and they can also fly. And it can fly far, as many as several kilometers or even tens of thousands of meters.