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| Author | Title | Year | Publication  |
Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Mulcahy, N.J.; Call, J. | Apes save tools for future use | 2006 | Science (New York, N.Y.) | 466 | 312 | 1038-1040 |
| Galdikas, B.M. | Orangutan tool use | 1989 | Science (New York, N.Y.) | 2847 | 243 | 152 |