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Hearing in the crocodilia.

E G Wever

    Proceedings of the National Academy of Sciences of the United States of America
    |July 1, 1971
    PubMed
    Summary
    This summary is machine-generated.

    This study measured auditory sensitivity in three crocodilian species. These reptiles exhibit high sound reception capabilities, particularly in mid-range frequencies.

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    Area of Science:

    • Comparative bioacoustics
    • Auditory neuroscience
    • Herpetology

    Background:

    • Understanding reptilian auditory systems provides insights into vertebrate sensory evolution.
    • Crocodilians represent a unique lineage for studying the development of hearing.
    • Previous research on reptile hearing has been limited.

    Purpose of the Study:

    • To quantify auditory sensitivity in three crocodilian species.
    • To compare sound reception capabilities across different crocodilian subfamilies.
    • To establish a baseline for crocodilian auditory function relative to other vertebrates.

    Main Methods:

    • Electrophysiological recordings of cochlear potentials were used.
    • Auditory sensitivity was measured in young specimens of Caiman crocodilus, Alligator mississippiensis, and Crocodylus acutus.

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  • Frequency-specific auditory thresholds were determined.

    • Main Results:

    • All three species demonstrated similar auditory sensitivity patterns.
    • Optimal hearing occurred within a broad middle frequency range.
    • Sensitivity decreased for lower frequencies and rapidly declined for higher frequencies.
    • Mid-range auditory sensitivity was notably high compared to other reptiles, birds, and mammals.

    Conclusions:

    • Crocodilians possess sophisticated auditory systems with high sensitivity.
    • The auditory capabilities of Alligatorinae and Crocodylinae subfamilies are comparable.
    • These findings contribute to our understanding of vertebrate hearing evolution.