Across
- 5. the way air moves through the avian respiratory system
- 7. opposite of the mammal lung the avian lung is
- 8. breathing technique used by birds to release heat
Down
- 1. the small tubules leading to air capillaries
- 2. the system of gas exchange in birds
- 3. chemical process through which energy is generated, specifically increased during flight
- 4. the bird's voice-box
- 6. each bird has 9 of these storage units.