Assertion: nightingale's note | /r/CapableOf | perform impressive trillin birds
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text: To perform this impressive trillin birds, an uninterrupted note made of repeating elements produced at high speed, often at a stable pitch the bird must pair impeccably timed breath control with independent muscle movements on each side of the syrinxSEE-rinksthe bird voice box, located at the branch point between the trachea and bronchi and containing vibrating tissues called labia, in songbirds capable of making two sounds at once via independent muscle control.