Humans vocalize primarily non-harmonically (talk), but some can also vocalize harmonically (sing). Birds, likewise, mostly vocalize non-harmonically (chatter), but some can vocalize harmonically. It would be most helpful, when discussing birds, mice, and whale “songs,” if scientists would clarify whether they mean non-harmonic or harmonic vocalizations.
Peter Wilson Simi Valley, Calif.
From the Nature Index
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