I want to know the answer to the following question:
Which animal has one of the most complex respiratory system of all animal groups?
All the background I'm provided with is that "Sound production is achieved using the syrinx, a muscular chamber incorporating multiple tympanic membranes which diverges from the lower end of the trachea; the trachea being elongated in some species, increasing the volume of vocalizations and the perception of the bird's size.". Is that enough to answer the question?