Birds must overcome gravity and drag to be able to life itself in the air. Lift is the upward force and thrust is the forward force that can be produced by the bird itself. When the lift and thrust is equal and opposite to gravity and the weight, the bird can finally fly in the air. The wing of the bird allow the forward thrust movement. Everytime the wing flaps it produces force to move forward. Once the bird is in the air, airfoils are produced . The bird wing creates the air flow through airstream then circulate the air and brings its body up. The orientation of the wing is essential to keep the balance for the body and fight against the drag. Wing tips of birds have slots where it can adjust the air turbulence. It makes the body either horizontal or vertical in the air to provide lift and slow speed at the same time. The slot and the adjustment of air is vital for birds when the bird has to take off or land on the ground. The modern aircrafts also resemble these slots for a more stable flight.
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