Air sacs in birds serve multiple functions:
- Respiration: They act as bellows to move air efficiently through the lungs.
- Oxygen Storage: They store oxygen for high-demand activities like flight.
- Weight Reduction: Thin-walled, air-filled sacs reduce body weight.
- Thermoregulation: They facilitate heat exchange to maintain body temperature.
- Vocalization: They act as resonating chambers for sound production.
- Flight Efficiency: They help maintain body shape and reduce air resistance during flight.