In the rain forests of Hainan, China, two species of squirrel create grooves on the surface of smooth nuts so that they can wedge them in the forks between branches.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10328493 | PMC |
http://dx.doi.org/10.7554/eLife.89823 | DOI Listing |
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