Extra Vocal Folds Give Koalas Deeper Voices | Video

This video shows the extra vocal folds in the throat of a koala, that gives it a deep-pitched voice. The male's "bellowing" vocalizations can also be heard, which are used to woo females during the mating season.



via LiveScience.com http://www.livescience.com/41612-extra-vocal-folds-give-koalas-deeper-voices-video.html