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A remarkable case study based on a detailed comparison of non-human primates and human infants brings together key abilities that provide the foundation for language. This link makes the case for phylogenetic continuity across species and ontogenetic continuity from infancy to childhood. Examined here are the fundamental aspects of language acquisition, such as vocalizations, mapping of meaning on to sound, use of gestures to communicate and to symbolize, tool use, object concept and memory. This volume goes a step further to analyse the similarities and differences across species, and how these influence the evolution of language. The author provides evidence linking abilities associated with language acquisition and describes fascinating hypotheses about the origins of language.