| 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. |
|
