Social Perspectives of Language Evolution: A review of The Evolutionary Emergence of Language: Social Function and the Origins of Linguistic Form, edited by Chris Knight, Michael Studdert-Kennedy & James R. Hurford, 2000. Cambridge: Cambridge University Press; ISBN 0-521-78696-7 paperback, £16.95 & US$27.95; ISBN 0-521-78157-4 hardback, £45 & US$74.95, xi + 426 pp., ills.