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Related Experiment Videos

Why snakes have forked tongues.

K Schwenk

    Science (New York, N.Y.)
    |March 18, 1994
    PubMed
    Summary
    This summary is machine-generated.

    Snakes use their forked tongues as chemosensory edge detectors to follow scent trails, aiding in hunting and reproduction. This specialized tongue helps them instantly assess chemical gradients for efficient foraging.

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    Area of Science:

    • Herpetology
    • Sensory Biology
    • Evolutionary Biology

    Background:

    • The function of the serpent's forked tongue has been a long-standing mystery in herpetology.
    • Previous research has offered various hypotheses but lacked comprehensive support.

    Purpose of the Study:

    • To investigate and support the hypothesis that the forked tongue functions as a chemosensory edge detector.
    • To elucidate the role of the forked tongue in prey detection, conspecific tracking, and foraging behavior.

    Main Methods:

    • Integration of existing theories on tongue function.
    • Analysis of anatomical structures related to the tongue and vomeronasal organ.
    • Examination of neural circuitry involved in chemosensation.
    • Behavioral observations of snakes during foraging and social interactions.

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    Main Results:

    • Evidence supports the forked tongue's role in detecting chemical gradients by sampling two points simultaneously.
    • This mechanism allows for instantaneous assessment of trail location for prey and conspecifics.
    • Forked tongues have evolved independently multiple times in squamate reptiles and are linked to wide-ranging foraging strategies.

    Conclusions:

    • The forked tongue is a crucial chemosensory tool enabling snakes to effectively follow pheromone trails.
    • This adaptation likely contributed to the evolutionary success of advanced snakes, particularly in reproduction and foraging.