Bird wings are shaped in a unique way, so that they create pressure differential or tiny tornadoes on their wings. When birds want to fly, the pressure is greater on the bottom of the wing and when the bird wants to land, the pressure above the wing is higher. This is kind of like how an airplane works. Birds don’t just fly because of their wings. Sure, wing help them get off of the ground and helps them steer, but is one MAIN thing that bird has inside of its body! Birds have hollow bones. These hollow bones are held up by complex structures in the bone. These hollow bones make the bird lighter so that it can fly! Birds also do not have bladders. That makes the lighter. These are the nifty adaptations birds have to fly!
