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Birds, behavior, and anatomical evolution.

J S Wyles, J G Kunkel, A C Wilson

    Proceedings of the National Academy of Sciences of the United States of America
    |July 1, 1983
    PubMed
    Summary
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    Bird anatomical diversity is greater than previously thought, rivaling other vertebrates. This study suggests rapid evolution driven by behavior, not just environment, in avian and mammalian species.

    Area of Science:

    • Evolutionary biology
    • Comparative anatomy
    • Paleontology

    Background:

    • For over a century, birds have been considered anatomically uniform compared to other vertebrate classes.
    • This perception challenges emerging evidence of significant anatomical variation within avian species.

    Purpose of the Study:

    • To investigate the extent of anatomical diversity among bird species.
    • To explore the evolutionary rates and driving forces behind anatomical changes in vertebrates, particularly birds.

    Main Methods:

    • Comparative anatomical analysis across over 200 bird species.
    • Integration of biochemical and geological data to assess evolutionary timescales.
    • Correlation analysis between relative brain size and anatomical evolution rates in land vertebrates.

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    Main Results:

    • Avian anatomical differences are as substantial as those in other vertebrate classes of comparable taxonomic rank.
    • Evidence suggests a potentially short timescale for bird evolution, comparable to placental mammals.
    • A positive correlation was found between relative brain size and the rate of anatomical evolution in land vertebrates.

    Conclusions:

    • Bird anatomy is more diverse than traditionally believed.
    • Behavioral innovation and social learning may be key drivers of rapid anatomical evolution in higher vertebrates.
    • Relative brain size could be an indicator of evolutionary rate in terrestrial vertebrates.