Merck Manual

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Is That a Pit Viper?
Is That a Pit Viper?

    Pit vipers have certain features that can help distinguish them from nonvenomous snakes:

    Nonvenomous snakes tend to have the following:

    If people see a snake with no fangs, they should not assume it is nonvenomous because the fangs may be retracted.

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Snakebites Snakebites