The vocal organ of birds — analogous to the human larynx — located at the base of the trachea, where it splits into the two bronchi.
The syrinx is what allows parrots to mimic human speech with such accuracy. Unlike the human larynx, the syrinx has two independent membranes, one for each bronchus, which can vibrate at different frequencies simultaneously. This is why birds can produce two notes at once.
Diseases that affect the syrinx — most commonly fungal (aspergillosis) or viral infections — present as voice changes, wheezing, or a sudden loss of vocalisation. Any sudden change in your bird's voice is worth a vet visit.
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