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Summary of ch.29 that includes all definitions and most important points.,…

- - - - Feathers that cover the body, wings, and tail of a bird are called contour feathers
        Down feathers are soft feathers located beneath the contour feathers.
- - - - A strong, lightweight skeleton allows birds to fly.
      - The bones of birds are unique because they contain cavities of air.
      - Large, powerful flight muscles called keel attach to the sternum.