Big-brained birds survive better in nature

Daniel Sol, Tamás Székely, András Liker, Louis Lefebvre

    Research output: Contribution to journalArticleResearchpeer-review

    145 Citations (Scopus)


    Big brains are hypothesized to enhance survival of animals by facilitating flexible cognitive responses that buffer individuals against environmental stresses. Although this theory receives partial support from the finding that brain size limits the capacity of animals to behaviourally respond to environmental challenges, the hypothesis that large brains are associated with reduced mortality has never been empirically tested. Using extensive information on avian adult mortality from natural populations, we show here that species with larger brains, relative to their body size, experience lower mortality than species with smaller brains, supporting the general importance of the cognitive buffer hypothesis in the evolution of large brains. © 2007 The Royal Society.
    Original languageEnglish
    Pages (from-to)763-769
    JournalProceedings of the Royal Society B: Biological Sciences
    Issue number1611
    Publication statusPublished - 22 Mar 2007


    • Behavioural flexibility
    • Brain evolution
    • Life-history theory
    • Mortality rate


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