There are no vocal folds in avian species. Sound in the bird is produced in the [[Syrinx - Anatomy & Physiology|syrinx]]. The larynx is on the [[Hyoid Apparatus - Anatomy & Physiology|hyoid apparatus]]. There are paired arytenoids, one constrictor and one dilator muscle only. There is no [[Larynx - Anatomy & Physiology#Epiglottis|epiglottis]]. | There are no vocal folds in avian species. Sound in the bird is produced in the [[Syrinx - Anatomy & Physiology|syrinx]]. The larynx is on the [[Hyoid Apparatus - Anatomy & Physiology|hyoid apparatus]]. There are paired arytenoids, one constrictor and one dilator muscle only. There is no [[Larynx - Anatomy & Physiology#Epiglottis|epiglottis]]. |