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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13951446

Left, poisonous fang of an asp viper; right, head of an adder, with mouth wide open and tongue protruding. Chromolithograph by H.J. Ruprecht, 1877.

Original public domain image from Wellcome Collection

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Left, poisonous fang of an asp viper; right, head of an adder, with mouth wide open and tongue protruding. Chromolithograph by H.J. Ruprecht, 1877.

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