How could a bird change the tilt of its wings to slow down?

A bird can change the tilt of its wings, known as the angle of attack, to slow down by increasing the angle at which the wings meet the oncoming air. By tilting the wings upward, the bird creates more drag and increases lift momentarily, which helps to reduce speed. This maneuver allows the bird to control its descent and landing more effectively. Additionally, by adjusting wing feathers and spreading them out, the bird can further enhance drag and slow its flight.