Answer: Ok I think Birds are adapted to moving in the air. Their front limbs have turned into wings and their strong pectoral muscles move their feathered wings. Bird bones are hollow inside so that the body weight is as small as possible, which makes it easier for them to fly.Birds obtain thrust by using their strong muscles and flapping their wings. Some birds may use gravity (for example, jumping from a tree) to give them forward thrust for flight. Others may use a running take-off from the ground.
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