The Avian Respiratory System

12345678
Across
  1. 5. the way air moves through the avian respiratory system
  2. 7. opposite of the mammal lung the avian lung is
  3. 8. breathing technique used by birds to release heat
Down
  1. 1. the small tubules leading to air capillaries
  2. 2. the system of gas exchange in birds
  3. 3. chemical process through which energy is generated, specifically increased during flight
  4. 4. the bird's voice-box
  5. 6. each bird has 9 of these storage units.