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| Author | Title | Year  |
Publication | Serial | Volume | Pages |
|---|---|---|---|---|---|---|
| Van Schaik, C. | Why are some animals so smart? | 2006 | Scientific American | 2830 | 294 | 64-71 |
| Heinrich, B.; Bugnyar, T. | Just how smart are ravens? | 2007 | Scientific American | 4101 | 296 | 64-71 |