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An article about the group's research, which was conducted during the winter months between 2004 and 2008, appears in the March issue of the Journal of the Acoustic Society of America. Prior to Cetos' research, scientists had recorded sounds from whale pods that included calves. But Zoidis said they had difficulty pinpointing the particular animals responsible for the noises. She said the common theory among scientists was that humpback calves did not produce sound. She said Cetos researchers traced the sound back to its source, demonstrating that both male and female humpback calves make noises. The group is continuing to study the sounds, including when they are emitted. The researchers are trying to determine whether they are a potential indicator of stress.
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