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Assumptions about the birds' vocal tracts: | Assumptions about the birds' vocal tracts: | ||
* The birds are parrots | * The birds are parrots; thus they have internal tongue muscles, allowing them to pronounce retroflexes | ||
* Their tongues are pointed but can still be widened to make stops | * Their tongues are pointed but can still be widened to make stops | ||
* They can produce tongue height | * They can produce tongue height | ||