Abstract
The vocal behaviors of human infants develop in stages. At the age of about 1 year, the typical infant acquires the first word of spoken language (Oiler 1980, 1986; Stark 1980). Although there have been many studies of vocal development in human infants, few studies have systematically reported on the vocal development of chimpanzee infants (Heyes 1951; Marler and Tenaza 1977; Plooij 1984). In the present study, the early development of vocal behaviors in a chimpanzee infant was investigated.
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