The Rhinoceros (close Up) - The Rhinoceros Is A Large, Primitive Looking Mammal That In Fact Dates From The Miocene Era Millions Of Years Ago. In Recent Decades Rhinos Have Been Relentlessly Hunted To The Point Of Near Extinction. Since 1970 The World Rhino Population Has Declined By 90 Percent, With Five Species Remaining In The World Today, All Of Which Are Endangered. Photo