Linguists, biological anthropologists, and cognitive scientists come together in this book to explore the origins and early evolution of phonology, syntax, and semantics. They consider the nature of pre- and proto-linguistic communication, the internal and external triggers that led to its transformation into language, and whether and how language may be considered to have evolved after its inception. Evidence is drawn from many domains, including computer simulations of language emergence, the songs of finches, problem-solving abilities in monkeys, sign language, and the structure of languages today.