Human language is a weird communication system: it has more in common with birdsong than with the calls of other primates. In this wide-ranging and accessible overview, first published in 2000, Jean Aitchison explores the origins of human language and how it has evolved. She likens the search to a vast pre-historic jigsaw puzzle, in which numerous fragments of evidence must be assembled. Such evidence is pieced together from a mixture of linguistic and non-linguistic sources like evolution theory, archaeology, psychology, and anthropology. She explains why language is so strange, outlines recent theories about its origin, and discusses possible paths of evolution.