Vocalization

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 Phonology it can refer to the replacement of a Consonant sound with a Vowel sound, e.g. for ''milk'' in many accents of English (see L-vocalization ) or for ''hier'' in German .

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