Stock Photo: Guinea hog and Merian opossum. . Sus scrofa, Didelphys murina. . Hand-colored copperplate engraving from a drawing by Maria Sybilla Merian from Ebenezer Sibly's "Universal System of Natural History" 1794. . . The prolific Sibly published his Universal System of Natural History in 1794~1796 in five volumes covering the three natural worlds of fauna, flora and geology. The series included illustrations of mythical beasts such as the sukotyro and the mermaid, and depicted sloths sitting on the grou