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An Investigation into the Cognition Behind Spontaneous String Pulling in New Caledonian Crows
- Alex H. Taylor,
- Felipe S. Medina,
- Jennifer C. Holzhaider,
- Lindsay J. Hearne,
- Gavin R. Hunt,
- Russell D. Gray
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- Published: February 22, 2010
- https://doi.org/10.1371/journal.pone.0009345