The Vocalization reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Vocalization

In animals, vocalization is a means of communication generated in many cases by their primitive versions of vocal chords.

In birds, it may be achieved by whistling but can communicate a number of things including danger.

It is also used to describe the noises made via the blowhole of mammalian sea creatures such as whales and porpoises.

In humans, it is a special means of communication called speech.

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