Lacking a syrinx-the vocal organ of birds-its only vocalizations are grunts or low hisses.
From the en.wikipedia.org
The syrinx is the sound-producing vocal organ of birds, located at the base of a bird's trachea.
From the en.wikipedia.org
Dr. Tobias had demonstrated that an isolated male vocal organ can be stimulated to produce the advertisement call.
From the sciencedaily.com
In finches, the vocal organ is the syrinx.
From the sciencedaily.com
Mindlin, professor of physics at the University of Buenos Aires, and his students have created a mathematical model of the mechanics of the movement of the syrinx, the avian vocal organ.
From the sciencedaily.com
He chose as his major emphasis, choral conducting, vocal pedagogy and organ.
From the ocregister.com
For example, in songbirds like zebra finches that might mean forging connections to the dozens of muscles that control a vocal organ called the syrinx, as well as brain areas involved in learning.
From the newscientist.com
Instead, bird calls are produced by the syrinx, a vocal organ found only in birds, and which is not related to the larynx, meaning it evolved independently from the vocal organs in reptiles.
From the en.wikipedia.org
Sacred holiday selections by vocal and organ soloists.