Ethology CURRENT ISSUES – PERSPECTIVES AND REVIEWS Intelligence in Corvids and Apes: A Case of Convergent Evolution? Amanda Seed*, Nathan Emery & Nicola Claytonà * Department of Psychology, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany School of Biological & Chemical Sciences, Queen Mary University of London, London, UK à Department of Experimental Psychology, University of Cambridge, Cambridge, UK (Invited Review) Correspondence Abstract Nicola Clayton, Department of Experimental Psychology, University of Cambridge, Downing Intelligence is suggested to have evolved in primates in response to com- Street, Cambridge CB23EB, UK. plexities in the environment faced by their ancestors. Corvids, a large- E-mail:
[email protected] brained group of birds, have been suggested to have undergone a con- vergent evolution of intelligence [Emery & Clayton (2004) Science, Vol. Received: November 13, 2008 306, pp. 1903–1907]. Here we review evidence for the proposal from Initial acceptance: December 26, 2008 both ultimate and proximate perspectives. While we show that many of Final acceptance: February 15, 2009 (M. Taborsky) the proposed hypotheses for the evolutionary origin of great ape intelli- gence also apply to corvids, further study is needed to reveal the selec- doi: 10.1111/j.1439-0310.2009.01644.x tive pressures that resulted in the evolution of intelligent behaviour in both corvids and apes. For comparative proximate analyses we empha- size the need to be explicit about the level of analysis to reveal the type of convergence that has taken place. Although there is evidence that corvids and apes solve social and physical problems with similar speed and flexibility, there is a great deal more to be learned about the repre- sentations and algorithms underpinning these computations in both groups.