Indian rhinoceros or greater one-horned rhino, Rhinoceros unicornis, vulnerable. . Handcolored copperplate engraving by Nussbiegel after an illustration by Ridinger from Dr. Johann Schreber's Die Saugthiere in Abbildungen nach der Natur (Mammals in Pictures after Nature), Wolfgang Walther, Erlangen, Germany, 1775. Schreber was a German naturalist and professor of natural history at Erlangen University from 1770.