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Updated: Dec 11, 2025

Creating Avian Forebrain Chimeras to Assess Facial Development
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Long life evolves in large-brained bird lineages.

Dante Jiménez-Ortega1,2, Niclas Kolm3, Simone Immler4

  • 1Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad de México, 04510, México.

Evolution; International Journal of Organic Evolution
|August 26, 2020
PubMed
Summary
This summary is machine-generated.

Larger brain size in birds directly and indirectly leads to longer lifespans by enhancing behavioral flexibility and influencing life history traits, supporting the cognitive buffer hypothesis.

Keywords:
Brain sizecognitive buffer hypothesislife historylongevityphylogenetic path analysis

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Area of Science:

  • Evolutionary biology
  • Comparative anatomy
  • Behavioral ecology

Background:

  • The brain is metabolically expensive, yet larger relative brain size is linked to slower life histories.
  • The cognitive buffer hypothesis suggests large brains increase survival via behavioral flexibility, promoting longevity.
  • Alternatively, long lifespans might pre-adapt species for evolving larger brains.

Purpose of the Study:

  • To investigate the evolutionary relationships between brain size, body size, life history, and longevity in birds.
  • To test the cognitive buffer hypothesis and alternative scenarios using phylogenetic methods.

Main Methods:

  • Phylogenetic path analysis was employed.
  • Data were analyzed across 339 altricial and precocial bird species.

Main Results:

  • A direct causal relationship was found between brain size and lifespan.
  • Indirect effects of brain size on lifespan were observed through other life history traits.
  • Results support the cognitive buffer hypothesis.

Conclusions:

  • Larger brain size promotes longer life in birds.
  • Behavioral flexibility, mediated by brain size, is a key factor in increased longevity.