Birds have a completely different vocal equipment than humans. They call this organ “syrinx”. This is what ornithologist Maya Thompson from the University of Cornwall says.
The vocal apparatus of birds is located in the lower part of the trachea. Birds do not pass air through their vocal cords to create sound, but they control muscles in the walls of the syrinx.
The bird’s voice comes directly from its chest. To cure this, it stretches its neck, opens its beak and then closes it. However, this sound is still controlled by the syrinx.
But copying human speech can be difficult. We have very complex sounds like plosive consonants. We use our lips to pronounce them, while parrots use the “esophageal voice”, a type of tracheal burp. If we talk about vowels, parrots change these sounds with the help of tongue movements and the width of the beak opening.
Source: Ferra

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