Vocal play (in the form of babbling) does not appear to be unique to humans. Elowson et al. note that this behaviour occurs in juvenile pygmy marmosets, that response from a caregiving adult is more likely when the juvenile is vocalising, and suggest that pygmy marmoset babbling has relevance to understanding the evolutionary processes of human vocal development.-- from The Evolution of Music: Theories, Definitions and the Nature of the Evidence by Ian Cross and Iain Morley (2002)
But this is the opposite of pleasing:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgT-5X-CGx-RegmbY3atF8rCd_xJdG1otlIQUvfe6WCZphqfy23T8PlqJIE0fwNkFHxAuhIHfIaOQM2HN_N-6kmXaeQJzx9R9sZLKs8lJL56Frgp38BPb9u7DXh7eH2CRG5sm51bQDcY6mz/s400/Investigations_Cambridghe_primates.8.jpg)
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