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Related Experiment Videos

Defensive Spray of a Phasmid Insect.

T Eisner

    Science (New York, N.Y.)
    |May 14, 1965
    PubMed
    Summary
    This summary is machine-generated.

    The walkingstick insect ejects a spray from thoracic glands when disturbed, deterring most predators like ants, beetles, and birds. However, this defense mechanism is ineffective against opossums.

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    Area of Science:

    • Entomology
    • Animal Behavior
    • Chemical Ecology

    Background:

    • The walkingstick insect (Anisomorpha buprestoides) possesses thoracic defensive glands.
    • These glands eject an aimed spray as a defense mechanism when the insect is disturbed.

    Purpose of the Study:

    • To investigate the defensive spray's effectiveness against various predators.
    • To understand the triggers for the spray discharge.

    Main Methods:

    • Observational studies on Anisomorpha buprestoides behavior.
    • Predator-prey interaction trials involving the insect's spray secretion.

    Main Results:

    • The spray discharge is typically triggered by contact stimulation.
    • Birds approaching the insect can also elicit the spray.

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  • The secretion effectively deterred ants, predaceous beetles, mice, and blue jays.
  • Opossums were not deterred by the defensive spray.

    • Conclusions:

    • Anisomorpha buprestoides utilizes an effective chemical defense against a range of predators.
    • Predator-specific effectiveness suggests evolutionary adaptations in both predator and prey.
    • The spray's efficacy varies, highlighting the complex dynamics of predator-prey interactions.