Across
- 4. If a bird and cow bone were identical in size and shape, the cow bone would weigh _____.
- 6. the hollow part of a feather
- 8. The faster a wing is traveling through the air, the greater the _____.
- 9. the ty of feathers that provide insulation for birds
- 10. A cormorant wants its feathers to get wet so it can dive deep _____.
- 12. the gland that makes oil birds use to waterproof their feathers
- 13. When a large bird takes off, it usually _____ into the wind.
Down
- 1. When a bird flaps its wings downward, they are spread out to increase _____.
- 2. Hollow feather shafts, hollow bones, wings, and streamlined bodies are all _____ features that allow birds to fly.
- 3. A birds bones are mostly _____.
- 5. the part of a feather that is like Velcro
- 7. A _____ body reduces air resistance, making it easier to fly.
- 11. When an airplane is flying, there is more _____ below the wing than above the wing.