http://www.livescience.com/15928-dolphins-whistles-talk-humans.html
Dolphins 'Talk' Like Humans, New Study Suggests
Jeanna Bryner, LiveScience Managing EditorDate: 07 September 2011 Time: 09:32 AM ET
"The dolphins aren't actually talking, though.
'It does not mean that they talk like humans, only that they communicate with sound made in the same way,' Madsen told LiveScience.
'Cetean ancestors lived on land some 40 million years ago and made sounds with vocal folds in their larynx," Madsen said, referring to the group of mammals to which dolphins belong. "They lost that during the adaptations to a fully aquatic lifestyle, but evolved sound production in the nose that functions like that of vocal folds.'
This vocal ability also likely gives dolphins a broader range of sounds."
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