Example videos of the spontaneous stone-passing task and the social vs. asocial conditions (Tests 1a &amp; 2b) in New Caledonian crows (<i>Corvus moneduloides</i>).
Jelbert S, Singh P, Gray R, Taylor A
CC BY 4.0
<a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4534463/bin/pone.0133253.s001.mp4">S1 Movie</a> from <cite style="font-style:normal">Jelbert S, Singh P, Gray R, Taylor A (2015). "<a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4534463">New Caledonian Crows Rapidly Solve a Collaborative Problem without Cooperative Cognition</a>". <i>PLOS ONE</i>. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1371/journal.pone.0133253">10.1371/journal.pone.0133253</a>. <a href="https://en.wikipedia.org/wiki/PMID" class="extiw" title="w:PMID">PMID</a> <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pubmed/26266937">26266937</a>. <a href="https://en.wikipedia.org/wiki/PubMed_Central" class="extiw" title="w:PubMed Central">PMC</a>: <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4534463">4534463</a>.</cite>