WebAvian lungs are relatively compact, with a bird's lungs being approximately 50% as large as the lung of a mammal of a similar size. The lungs are unlobed and do not have the … WebThe increased ventilation in these birds is brought about by deeper as well as by more rapid breathing. The respiratory system of birds is also used for communication through song. The “voice box” is the syrinx, a membranous structure at the lower end of the trachea. Sound is produced only when air flows outward across the syrinx.

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