Paradoxical frog, Pseudis paradoxa (top), and Labyrinthine toad-frog, Leptodactylus labyrinthicus (bottom). Handcolored copperplate engraving from G. T. Wilhelm's "Encyclopedia of Natural History: Amphibia," Augsburg, 1794. Gottlieb Tobias Wilhelm (1758-1811) was a Bavarian clergyman and naturalist known as the German Buffon.

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Photo credit: © Florilegius / Alamy / Afripics
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Keywords: 18th, amphibia, century, copperplate, encyclopedia, engraving, frog, gottlieb, hand-colored, herpetology, history, labyrinthicus, labyrinthine, leptodactylus, marginata, natural, naturgeschichte, paradoxa, paradoxical, pseudis, rana, toad, tobias, unterhaltungen, wilhelm