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Related Experiment Videos

Spontaneous metatool use by New Caledonian crows.

Alex H Taylor1, Gavin R Hunt, Jennifer C Holzhaider

  • 1Department of Psychology, University of Auckland, Private Bag 92019, Auckland, New Zealand. atay096@ec.auckland.ac.nz

Current Biology : CB
|August 19, 2007
PubMed
Summary
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New Caledonian crows demonstrate advanced cognitive abilities by spontaneously solving complex metatool tasks. This suggests analogical reasoning, not just trial-and-error, underlies their sophisticated tool use.

Area of Science:

  • Cognitive Ethology
  • Avian Cognition
  • Evolutionary Psychology

Background:

  • Metatool use, employing one tool on another, is a key evolutionary development.
  • Great apes exhibit metatool capabilities, while monkeys generally do not.
  • New Caledonian crows are known for exceptional tool manufacturing.

Purpose of the Study:

  • To investigate spontaneous metatool use in New Caledonian crows.
  • To determine the cognitive mechanisms underlying their problem-solving abilities.
  • To explore the link between analogical reasoning and tool use in this species.

Main Methods:

  • A demanding metatool task was designed where crows used a short tool to retrieve a longer one.
  • The task required extracting a long tool to access a food reward (meat).

Related Experiment Videos

  • Behavior was analyzed to rule out trial-and-error or previously learned rules.

    • Main Results:

    • Six of seven crows spontaneously attempted the metatool task.
    • Four crows succeeded in obtaining the reward on their first trial.
    • Evidence indicated analogical reasoning rather than associative learning.

    Conclusions:

    • New Caledonian crows possess sophisticated physical cognition enabling spontaneous metatool use.
    • Analogical reasoning appears to be a significant factor in their problem-solving.
    • This cognitive capacity may explain their advanced tool-manufacturing skills.