| 329 | -- | 330 | Jeffrey C. Schank. The evolution and function of play |
| 331 | -- | 339 | Sergio M. Pellis, Gordon M. Burghardt, Elisabetta Palagi, Marc Mangel. Modeling play: distinguishing between origins and current functions |
| 340 | -- | 353 | Sabine Durand, Jeffrey C. Schank. The evolution of social play by learning to cooperate |
| 354 | -- | 361 | Jeremy Auerbach, Andrew R. Kanarek, Gordon M. Burghardt. To play or not to play? That's a resource abundance question |
| 362 | -- | 370 | Nicholas Grunloh, Marc Mangel. State-dependent behavioral theory and the evolution of play |
| 371 | -- | 380 | Heather C. Bell, Greg D. Bell, Jeffrey A. Schank, Sergio M. Pellis. Evolving the tactics of play fighting: insights from simulating the "keep away game" in rats |
| 381 | -- | 391 | Brian C. O'Meara, Kerrie Lewis Graham, Sergio M. Pellis, Gordon M. Burghardt. Evolutionary models for the retention of adult-adult social play in primates: The roles of diet and other factors associated with resource acquisition |