Rhinoceros unicornisRhinoceros unicornis, Kaziranga National Park, Assam, India.Source: Deepraj at Wiki Commons. Colour levels corrected from original.
Equus ferus ferus (Tarpan) - extinct speciesOnly known illustration of a tarpan made from life, depicting a five month old colt.From The extinction website
Die Sugthiere in Abbildungen nach der Natur /.Erlangen :Expedition des Schreber'schen sugthier- und des Esper'schen Schmetterlingswerkes [etc.,1774]-1846..biodiversitylibrary.org/page/31078302
Przewalski's Horse (Equus ferus przewalskii) in captivity at San Diego Zoo, San Diego, California, USA. Photographed on 3 June 2002www.inaturalist.org/observations/54793599
Die Sugthiere in Abbildungen nach der Natur /.Erlangen :Expedition des Schreber'schen sugthier- und des Esper'schen Schmetterlingswerkes [etc.,1774]-1846..biodiversitylibrary.org/page/31078310