The Rhinocerotidae-family consists of many species of extinct, but also still extant species of rhinoceros. A typical rhinoceros is large in size, has a single or multiple horns on its face and has a thick skin. They were once widespread and common throughout the Northern Hemisphere and Africa and lived in a wide range of habitats. Some species are known as one the largest land mammals that ever existed, like Paraceratherium. Rhinoceroses are strictly herbivorous and probably ate a wide variety of vegetation, like grasses, leaves and aquatic vegetation.