Fossils Reveal When Animals Started Making Noise | Scientific American
Bird Syrinx Animation | Bird, Ornithology, Disney characters
Voice research
The biology of birds. Birds. 126 THE BIOLOGY OF BIRDS membranes function as vocal cords. Their tension is regulated by muscles attached to the wall of the syrinx. A detailed account
The bird voice box is one of a kind in the animal kingdom | Science | AAAS
How do Birds Sing? Learn About Bird Song ID & More
No Feather Left Behind: How Do Birds Talk Without Vocal Chords?
Fossils Reveal When Animals Started Making Noise | Scientific American
Syrinx (bird anatomy) - Wikipedia
Syrinx (bird anatomy) - Wikipedia
Birds Singing : Twootz.com
Syrinx (bird anatomy) - Wikipedia
Birds reinvent voice box in novel evolutionar | EurekAlert!
The vocal organ of hummingbirds shows convergence with songbirds | Scientific Reports
Why can parrots talk like humans? Can they imitate any language they hear? - Quora
Why do parrots talk and how do they achieve it if they do not have vocal cords - Infobae
Vocal tract anatomy of king penguins: morphological traits of two-voiced sound production | Frontiers in Zoology | Full Text
First birds made honking sounds more than 66 million years ago | New Scientist
Bird communication
The Oldest Bird Voice Box Ever Found - The New York Times
Birds Reinvent Voice Box in Novel Evolutionary Twist - UT News
Bird Vocalizations : Montana Science Partnership
