What is the primary purpose of the coiled structure in the Sarus crane's trachea?

Answer

To amplify its loud trumpeting calls

The Sarus crane possesses a unique modification where its trachea coils into a chamber, which functions to amplify its powerful trumpeting vocalizations.

What is the primary purpose of the coiled structure in the Sarus crane's trachea?
behaviorbirdSarus Craneaggressivity