Change search
ReferencesLink to record
Permanent link

Direct link
Umeå University, Faculty of Social Sciences, Department of Psychology.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Tool-use and tool-manufacture are thought to require high cognitive skills and have been considered as an exclusive attribute to primates. Recent observations of New Caledonian crows (NCCs) challenge this assumption. In this study 13 NCCs were tested with two different tool production tasks. The NCC either had to straighten a hook or bend a stick to retrieve food from two different kinds of tree trunks. The result showed that 3/5 birds bent sticks and used them to retrieve food and 1/5 birds straightened hooks to retrieve food. The birds managed to solve both tasks but not the birds in the control group. This indicates that NCC's tool making is a flexible innovative act and not just an innate predisposition to bend flexible material. This finding is interesting given that recent studies on human children show that below 8 years of age children fail in similar innovative tool making tasks.

Place, publisher, year, edition, pages
2012. , 31 p.
Keyword [en]
Cognition New Caledonian crows tool-modification tool-use corvids
National Category
Zoology Psychology (excluding Applied Psychology)
URN: urn:nbn:se:umu:diva-60301OAI: diva2:559329
Subject / course
Masteruppsats i kognitionsvetenskap
Educational program
Master's Programme in Cognitive Science
Humanities, Theology
Available from: 2012-10-09 Created: 2012-10-08 Last updated: 2012-10-09Bibliographically approved

Open Access in DiVA

fulltext(1655 kB)355 downloads
File information
File name FULLTEXT01.pdfFile size 1655 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Alfredsson, Jessica
By organisation
Department of Psychology
ZoologyPsychology (excluding Applied Psychology)

Search outside of DiVA

GoogleGoogle Scholar
Total: 355 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 518 hits
ReferencesLink to record
Permanent link

Direct link