Rhinoceroses are large, herbivorous mammals identified by their characteristic horned snouts. The word "rhinoceros" comes from the Greek "rhino" (nose) and "ceros" (horn). There are five species and 11 subspecies of rhino; some have two horns, while others have onebr br There are 5 species of rhino in the world. br Rhinos can weigh over 3 tonnes. br Black and white rhinos are both, in fact, grey. br They're called bulls and cows. br WHAT ARE RHINO HORNS MADE OF? ...br Rhinos have poor vision. ...