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Across 2. grinds the bird's food to make it more easily digested 4. Birds are designed for quick ?, thereby keeping them light 7. deliver oxygen-rich blood to the bird's muscles 11. a tendon is attached to the Pect. minor and ?, which raises bird's wings 12. birds are designed for quick ? 13. birds don't have strong ? muscles 16. breastbone of bird, similar to a ship's keel 18. similar to the internal cross bracing found in bones 21. birds inhale and exhale ? to move each breath 23. pertaining to birds 24. Birds will sometimes swallow ? to help with digestion

Down 1. birds have air ?, that are like tiny tubes in which air flows thru 3. plumage 5. bird's hearts are much ? in relation to its body size 6. most powerful bird muscles 8. skull bones of birds are very ? 9. without these powerful things, birds couldn't fly 10. many bird bones are ? 14. this along with struts of bone, makes up bird's bill 15. Birds eat a lot because they need a lot of ? to fly 16. birds do not have ? glands in their respiratory system 17. Pectoralis ? muscles lowers the bird's wings in flight 19. a place which stores and moistens the bird's food 20. delivers oxygen-poor blood to the heart 22. air ? collect the air that the birds breathe