Great One-horned Rhinoceros Screensaver - Version 1.2 The Great One-horned Rhinoceros is a free screensaver created by RateMyScreensaver.com containing 13 high quality photographs. The Great One-horned Rhinoceros (Rhinoceros unicornis) is a large mammal found in Nepal and in Assam, India. It is confined to the tall grasslands and forests in the foothills of the Himalayas. The Indian Rhinoceros can run as fast as 55 km/h for short periods of time and is also an excellent swimmer.