AIRSAC

Bird's temperature regulator aid

• Alveolus

• Avian lung outgrowth

• Bird's body feature

• Bird's buoyancy aid

• Bird's organ

• Hollow part of a bird

• Lung cell

• Lung compartment

• Lung feature

• Part of the lung

• Pulmonary alveolus

• Pulmonary alveolus, put simply

• Respiratory cavity