Is flying a trait or learned behavior?

Flying is a trait. Birds are born with the ability to fly due to their anatomical adaptations. They have wings, which are modified forelimbs that flap to produce lift, allowing them to stay in the air. Additionally, birds have a light and hollow bone structure, which reduces their body weight and makes flying more efficient. The flight muscles, especially the pectoralis major, is well-developed and constitutes a significant portion of the bird's body mass. These muscles are responsible for generating the power required for flapping the wings.

While some skills related to flying, such as precise maneuvering, may be improved with practice and experience, the fundamental capability to fly is an inherent trait of birds that is present from birth.