Tool making cockatoos adjust the lengths but not the widths of their tools to function

• A. M. I. Auersperg ,

  Roles Conceptualization, Funding acquisition, Methodology, Project administration, Resources, Supervision, Validation, Writing – original draft, Writing – review & editing

  * E-mail: alice.auersperg@vetmeduni.ac.at

  ¶‡ AMIA and CK are co-first authors on this work.

  Affiliation Messerli Research Institute, University of Veterinary Medicine Vienna, Medical University of Vienna, University of Vienna, Vienna, Austria

  http://orcid.org/0000-0001-7405-9791

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• C. Köck ,

  Roles Formal analysis, Investigation, Writing – review & editing

  ¶‡ AMIA and CK are co-first authors on this work.

  Affiliation Department of Cognitive Biology University of Vienna, Vienna, Austria

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• M. O’Hara,

  Roles Conceptualization, Data curation, Formal analysis, Software, Visualization, Writing – review & editing

  Affiliation Messerli Research Institute, University of Veterinary Medicine Vienna, Medical University of Vienna, University of Vienna, Vienna, Austria

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• L. Huber

  Roles Writing – original draft, Writing – review & editing

  Affiliation Messerli Research Institute, University of Veterinary Medicine Vienna, Medical University of Vienna, University of Vienna, Vienna, Austria

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