When a bird jumps, it uses its feet to push against the ground. This force propels the bird into the air. However, the bird's body is also subject to gravity, which is pulling it back down to the ground.
In order to stay in the air, the bird must use its wings to create lift. Lift is a force that opposes gravity and keeps the bird from falling.
Birds create lift by flapping their wings. The flapping motion of the wings causes air to flow over the top of the wing and under the bottom of the wing. The air flowing over the top of the wing is moving faster than the air flowing under the bottom of the wing. This difference in air speed creates a pressure difference between the top and bottom of the wing. The pressure difference creates a force that lifts the bird into the air.
The amount of lift that a bird creates depends on the speed of the wing flaps and the angle of the wings. The faster the bird flaps its wings, the more lift it creates. The greater the angle of the wings, the more lift it creates.
Birds are able to control their flight by adjusting the speed of their wing flaps and the angle of their wings. This allows them to stay in the air, maneuver, and land safely.
