New Caledonian Crows Rapidly Solve a Collaborative Problem without Cooperative Cognition Jelbert, Sarah A. ; Singh, Puja J. ; Gray, Russell D. ; Taylor, Alex H. Abstract Publication: PLoS ONE Pub Date: August 2015 DOI: 10.1371/journal.pone.0133253 Bibcode: 2015PLoSO..1033253J