How is a bird's body adapted for flight?

even though the bird is smaller than its wings, it doesn't mean it weights less then the wings, it weights more than the wings, but the main reason for its flight, is from its bones; the bones are hollow, compared to a human bone, which its filled with a spongy liquidy solid or a non-newtonian fluid called bone marrow. If we had hallow bones like birds, we could jump really high up in the air. The wings cause an updraft to just "hover" or "propel" itself through the air, the wings are what causes it to move around and change direction. The bones, are what help it stay in the air, and lift off. We can't do that because of our bones, but birds can.