Animal Cognition

, Volume 7, Issue 4, pp 263–266

“Insightful” string-pulling in Grey parrots (Psittacus erithacus) is affected by vocal competence

Short Communication

DOI: 10.1007/s10071-004-0218-y

Cite this article as:
Pepperberg, I.M. Anim Cogn (2004) 7: 263. doi:10.1007/s10071-004-0218-y


Four Grey parrots (Psittacus erithacus) were tested on their ability to obtain an item suspended from a string such that mutiple, repeated, coordinated beak–foot actions were required for success (e.g., Heinrich 1995). Those birds with little training in referential English requests (e.g. “I want X”) succeeded, whereas birds who could request the suspended item failed to obtain the object but engaged in repeated requesting.


Grey parrotsString-pullingReferential requesting

Supplementary material

S1 Video of one of Arthur’s sessions.

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AVI (2.6 MB)

S2 Video of one of Alex’s sessions.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.MIT School of Architecture and PlanningCambridgeUSA