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Nature 434, 273-274 (17 March 2005) | doi:10.1038/434273a; Published online 16 March 2005

There is an Errata (31 March 2005) associated with this document.

Just for fun?

Bernd Heinrich1

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Working out why animals play is no easy task.

BOOK REVIEWEDThe Genesis of Animal Play: Testing the Limits

by Gordon M. Burkhardt

MIT Press: 2005. 518 pp. $50, £32.95

A kitten batting a ball of yarn, kids on a swing, or an adult wielding a fishing-rod — few would disagree that these behaviours can be described as play. Yet in the study of animal behaviour, the phenomenon of play is an anomaly.