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Extraordinary large brains in tool-using New Caledonian crows (Corvus moneduloides).

Julia Cnotka1, Onur Güntürkün, Gerd Rehkämper

  • 1Institute of Anatomy I, University of Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany. cnotkaj@uni-duesseldorf.de

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New Caledonian crows possess highly encephalized brains, indicating advanced cognitive abilities. This study reveals their relative brain size significantly exceeds that of other bird species, including other corvids.

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Area of Science:

  • Comparative neuroanatomy
  • Avian cognition
  • Evolution of intelligence

Background:

  • A correlation between brain size and cognitive ability is observed in birds and mammals, particularly in corvids.
  • Corvids exhibit complex behaviors and problem-solving skills, linked to relatively large brains and pallial enlargement.
  • New Caledonian crows are noted for exceptional object manipulation skills, but their relative brain size was unknown.

Purpose of the Study:

  • To investigate the relative brain size of New Caledonian crows.
  • To compare the encephalization levels of New Caledonian crows with other avian species, including corvids.
  • To determine if New Caledonian crows exhibit higher encephalization correlating with their advanced cognitive abilities.

Main Methods:

  • Comparative analysis of brain size in five New Caledonian crows against pooled data from four passerine species (7 European carrion crows, 2 European magpies, 3 European jays, 4 domestic sparrows).
  • Direct comparison of New Caledonian crow brain size with seven European carrion crows.
  • Comparison of New Caledonian crow brain size with published data from 140 avian species.

Main Results:

  • New Caledonian crows demonstrated significantly larger brains compared to the combined passerine group and specifically to European carrion crows.
  • Encephalization quotient analysis placed the New Caledonian crow among the highest recorded for avian species.
  • Their degree of encephalization surpassed that of seven other corvid species included in the literature data.

Conclusions:

  • New Caledonian crows exhibit a high degree of encephalization, suggesting a neurological basis for their remarkable cognitive and manipulative skills.
  • This finding supports the link between relative brain size and advanced cognitive functions in birds.
  • Further research into the neurobiology of New Caledonian crows can provide insights into the evolution of intelligence.