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Related Experiment Videos

Behavior and phylogeny: constriction in ancient and modern snakes.

H W Greene, G M Burghardt

    Science (New York, N.Y.)
    |April 7, 1978
    PubMed
    Summary

    Snake behavior, specifically coil application patterns, offers insights into evolutionary origins. Primitive snake families likely retained ancestral constriction behaviors, suggesting it was an early innovation.

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    Area of Science:

    • Ethology
    • Evolutionary Biology
    • Herpetology

    Background:

    • Comparative behavioral analyses can illuminate the role of ethoecological factors in the evolution of higher taxa.
    • Snake prey-capture behaviors, particularly constriction, are of evolutionary interest.

    Purpose of the Study:

    • To investigate patterns of coil application in snakes to understand their evolutionary history.
    • To determine if behavioral patterns correlate with taxonomic groups and infer ancestral behaviors.

    Main Methods:

    • Comparative analysis of 27 species (13 genera) in the advanced family Colubridae.
    • Comparative analysis of 48 species (26 genera) in primitive families: Acrochordidae, Aniliidae, Boidae, and Xenopeltidae.
    • Observation and classification of coil application patterns during prey capture.

    Main Results:

    • Twenty-seven species in the advanced family Colubridae displayed 19 distinct coil application patterns, with 1-2 patterns typically consistent within genera.
    • Forty-eight species in primitive families consistently used a single coil application pattern, irrespective of variations in age, size, shape, habitat, and diet.
    • This suggests a shared retention of an ancestral behavior pattern from the early Paleocene.

    Conclusions:

    • Behavioral patterns in primitive snake families indicate the retention of an ancient action pattern, likely originating from a common ancestor.
    • Constriction as a prey-killing tactic in snakes is ancient and may represent a key behavioral innovation.
    • This behavioral innovation could have influenced the evolution of the unique snake jaw mechanism.

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