Frogs conducting a duel: one frog has killed another with his sword, watched by their seconds. Photograph by J.P. Soule, 1876, after a drawing.

    Date:
    1876
    Reference:
    644719i

    Licence: Public Domain Mark

    Credit: Frogs conducting a duel: one frog has killed another with his sword, watched by their seconds. Photograph by J.P. Soule, 1876, after a drawing. Wellcome Collection. Source: Wellcome Collection.

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