Study suggests brain differences between making and using tools.
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References
Weir, A. A. S., Kenward, B. & Chappell, J. & Kacelnik, A. . Proc. R. Soc. Lond. B, published online, doi:10.1098/rsbl.2004.0183 (2004).
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Nelson, L. Crows switch sides to use tools. Nature (2004). https://doi.org/10.1038/news040322-6
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DOI: https://doi.org/10.1038/news040322-6